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US-12627891-B2 - Illuminating device

US12627891B2US 12627891 B2US12627891 B2US 12627891B2US-12627891-B2

Abstract

An illuminating device includes a projection device and an imaging device recording a first image and a second image. The projection device includes a light-emitting device generating a first light beam and a second light beam different from the first light beam to illuminate an object to be measured and a light gate device located in optical paths of the first and light beams and including a first light gate and a second light gate respectively located on a light incident surface and a light exit surface of the light gate device. The first and second light beams pass through the light gate device and respectively produces the first image in a first depth of field range and the second image in a second depth of field range different from the first depth of field range. The first and second image are projected on the object to be measured.

Inventors

  • Ching-Tze Huang

Assignees

  • QISDA CORPORATION

Dates

Publication Date
20260512
Application Date
20241111
Priority Date
20231121

Claims (20)

  1. 1 . An illuminating device, comprising: a projection device, comprising: a light-emitting device, configured to generate a first light beam to illuminate an object to be measured and generate a second light beam that is different from the first light beam to illuminate the object to be measured; and a light gate device, located in optical paths of the first light beam and the second light beam, wherein the light gate device comprises: a first light gate, located on a light incident surface of the light gate device; and a second light gate, located on a light exit surface of the light gate device, wherein the first light beam passes through the light gate device and produces a first image in a first depth of field range, and the second light beam passes through the light gate device and produces a second image in a second depth of field range that is different from the first depth of field range, and the first image and the second image are projected on the object to be measured; and an imaging device, configured to record the first image and the second image.
  2. 2 . The illuminating device according to claim 1 , wherein the first light beam has a first wavelength and the second light beam has a second wavelength that is different from the first wavelength.
  3. 3 . The illuminating device according to claim 1 , wherein the first light beam has a first polarization direction, and the second light beam has a second polarization direction that is substantially perpendicular to the first polarization direction.
  4. 4 . The illuminating device according to claim 1 , wherein the light incident surface and the light exit surface of the light gate device are parallel to each other.
  5. 5 . The illuminating device according to claim 1 , wherein a part of the first light beam passes through the first light gate, and the part of the first light beam completely passes through the second light gate.
  6. 6 . The illuminating device according to claim 1 , wherein the second light beam completely passes through the first light gate, and the second light beam partially passes through the second light gate.
  7. 7 . The illuminating device according to claim 1 , wherein the first light gate comprises a first pattern and a second pattern, wherein when the first light beam illuminates the first light gate, the first light beam penetrates through the first pattern, and the first light beam does not penetrate through the second pattern, wherein when the second light beam illuminates the first light gate, the second light beam penetrates through the first pattern and the second pattern.
  8. 8 . The illuminating device according to claim 1 , wherein the first light gate comprises a first pattern and a second pattern, wherein when the first light beam illuminates the first light gate, the first light beam penetrates through the first pattern, and the first light beam does not penetrate through the second pattern, wherein when the second light beam illuminates the first light gate, the second light beam does not penetrate through the first pattern, and the second light beam penetrates through the second pattern.
  9. 9 . The illuminating device according to claim 1 , wherein the second light gate comprises a third pattern and a fourth pattern, wherein when the first light beam illuminates the second light gate, the first light beam penetrates through the third pattern and the fourth pattern, wherein when the second light beam illuminates the second light gate, the second light beam does not penetrate through the third pattern, and the second light beam penetrates through the fourth pattern.
  10. 10 . The illuminating device according to claim 1 , wherein the second light gate comprises a third pattern and a fourth pattern, wherein when the first light beam illuminates the second light gate, the first light beam penetrates through the third pattern, and the first light beam does not penetrate through the fourth pattern, wherein when the second light beam illuminates the second light gate, the second light beam does not penetrate through the third pattern, and the second light beam penetrates through the fourth pattern.
  11. 11 . The illuminating device according to claim 1 , wherein the first light gate and the second light gate have different patterns.
  12. 12 . The illuminating device according to claim 1 , wherein the first light gate and the second light gate have a same pattern.
  13. 13 . The illuminating device according to claim 1 , wherein the first light beam is one of infrared light, red light, green light, blue light, near-ultraviolet light, and ultraviolet light, and the second light beam is one of infrared light, red light, green light, blue light, near-ultraviolet light, and ultraviolet light.
  14. 14 . The illuminating device according to claim 1 , wherein the imaging device comprises a first image sensor and a second image sensor, the first image sensor is configured to sense the first image, and the second image sensor is configured to sense the second image.
  15. 15 . The illuminating device according to claim 14 , wherein the first image sensor and the second image sensor simultaneously sense the first image and the second image.
  16. 16 . The illuminating device according to claim 14 , wherein the first image sensor senses the first image in a first time period, and the second image sensor senses the second image in a second time period different from the first time period.
  17. 17 . The illuminating device according to claim 1 , wherein the imaging device comprises an image sensor, and the image sensor senses the first image in a first time period and senses a second image in a second time period that is different from the first time period.
  18. 18 . The illuminating device according to claim 1 , wherein the imaging device comprises a lens, the lens is a movable lens, and the movable lens moves back and forth along the optical paths to change projection positions of the first image and the second image on the imaging device.
  19. 19 . The illuminating device according to claim 1 , wherein the imaging device comprises a lens, and the lens comprises a zoom lens for changing projection positions of the first image and the second image on the imaging device.
  20. 20 . The illuminating device according to claim 1 , wherein the imaging device comprises a lens, and the lens comprises a movable lens that moves in the lens along the optical paths to change a focal length of the lens.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of China application serial no. 202311554848.4, filed on Nov. 21, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification. BACKGROUND Technical Field The disclosure relates to an illuminating device. Description of Related Art A basic principle of a mouth scanner system is to generate structured light to illuminate a target object, and collect image light reflected by the target object (such as teeth) to establish a 3D surface model of the target object. A good mouth scanner may provide a large depth of field (DOF). When scanning an oral cavity, the mouth scanner with a larger DOF may provide excellent images of roots of teeth or molar deep parts that are difficult to be approached by a front end of the mouth scanner, so as to maintain accuracy of the entire mouth. In order to improve the DOF of the mouth scanner, commonly used techniques include changing a size of a lens aperture in the mouth scanner system. Since the deeper the DOF is, the smaller the lens aperture is, in order to increase the DOF, it is required to reduce the aperture size. However, this method sacrifices an overall light intensity, resulting in a decrease in resolution. Therefore, how to maintain system brightness and increase DOF has always been an important issue in the field of mouth scanners. SUMMARY The disclosure is directed to an illuminating device for simultaneously generating images with different depths of field. The disclosure provides an illuminating device including a projection device and an imaging device. The projection device includes a light-emitting device and a light gate device. The light-emitting device is configured to generate a first light beam to illuminate an object to be measured and generate a second light beam that is different from the first light beam to illuminate the object to be measured. The light gate device is located in optical paths of the first light beam and the second light beam. The light gate device includes a first light gate located on a light incident surface of the light gate device and a second light gate located on a light exit surface of the light gate device. The first light beam passes through the light gate device and produces a first image in a first depth of field range, and the second light beam passes through the light gate device and produces a second image in a second depth of field range that is different from the first depth of field range. The first image and the second image are projected on the object to be measured. The imaging device is configured to record the first image and the second image. According to some embodiments, the first light beam has a first wavelength and the second light beam has a second wavelength that is different from the first wavelength. According to some embodiments, the first light beam has a first polarization direction, and the second light beam has a second polarization direction that is substantially perpendicular to the first polarization direction. According to some embodiments, the light incident surface and the light exit surface of the light gate device are parallel to each other. According to some embodiments, a part of the first light beam passes through the first light gate, and the part of the first light beam completely passes through the second light gate. According to some embodiments, the second light beam completely passes through the first light gate, and the second light beam partially passes through the second light gate. According to some embodiments, the first light gate includes a first pattern and a second pattern. When the first light beam illuminates the first light gate, the first light beam penetrates through the first pattern, and the first light beam does not penetrate through the second pattern. When the second light beam illuminates the first light gate, the second light beam penetrates through the first pattern and the second pattern. According to some embodiments, the first light gate includes a first pattern and a second pattern. When the first light beam illuminates the first light gate, the first light beam penetrates through the first pattern, and the first light beam does not penetrate through the second pattern. When the second light beam illuminates the first light gate, the second light beam does not penetrate through the first pattern, and the second light beam penetrates through the second pattern. According to some embodiments, the second light gate includes a third pattern and a fourth pattern. When the first light beam illuminates the second light gate, the first light beam penetrates through the third pattern and the fourth pattern. When the second light beam illuminates the second light gate, the second light beam does not penetrate through the third pattern, and the second light beam penetrates through the fourth pattern. According