CN-122003634-A - Image projection apparatus

CN122003634ACN 122003634 ACN122003634 ACN 122003634ACN-122003634-A

Abstract

The image projection device (100) is provided with a projection unit (10) that includes a light source (11), a scanning unit (13), and a projection optical system (20), wherein the scanning unit (13) scans light rays (50) emitted from the light source (11), the projection optical system (20) causes a plurality of light rays (50) emitted from the scanning unit (13) in different directions by scanning by the scanning unit (13) to converge at a convergence point (70) in the user's eye (60) and then project the converged light rays onto the retina (61) to project an image onto the retina (61), an imaging unit (40) that images the user's eye (60), a generation unit (34) that generates an overlay image (82) that overlaps the imaged image (80) of the user's eye (60) imaged by the imaging unit (40) with a reference image (81) that shows an initial position (83) at which the user's pupil (62) should be aligned, and a projection control unit (31) that controls the projection unit (10) to project the overlay image onto the retina (61).

Inventors

Ku Yongshu
SUZUKI MAKOTO

Assignees

QD激光公司

Dates

Publication Date: 20260508
Application Date: 20241008
Priority Date: 20231130

Claims (9)

1. An image projection apparatus, comprising: A projection unit including a scanning unit that scans light emitted from a light source, and a projection optical system that causes a plurality of light rays emitted from the scanning unit in different directions by the scanning unit to converge at a convergence point in an eye of a user and then project the converged light rays onto a retina to project an image onto the retina; A photographing section that photographs an eye of the user; A generation unit that generates a superimposed image in which a captured image of the user's eyes captured by the imaging unit is superimposed on a reference image that displays a position at which the user's pupils should be aligned, and And a projection control unit that controls the projection unit to project the superimposed image onto the retina.
2. The image projection apparatus of claim 1, wherein, The generation section generates a first guide mark that guides the center position of the pupil of the user to coincide with the position, based on the center position of the pupil of the user photographed in the photographed image and the position in the reference image, The projection control section controls the projection section to project the first guide mark onto the retina.
3. The image projection apparatus of claim 2, wherein, The first guide mark is an arrow.
4. An image projection apparatus according to claim 1 or 2, characterized in that, The projection section and the photographing section are mounted on a frame worn by the user.
5. The image projection apparatus of claim 1, wherein, The image projection apparatus further includes an illumination light source mounted on a frame worn by the user together with the projection unit and the photographing unit, the illumination light source irradiating a plurality of illumination lights to eyes of the user, The generation section generates a second guide mark that guides intervals between the plurality of illumination lights captured in the captured image to a predetermined value, The projection control section controls the projection section to project the second guide mark onto the retina.
6. The image projection apparatus of claim 5, wherein, The second guide mark is a color that varies according to intervals between the plurality of illumination lights.
7. An image projection apparatus according to claim 5 or 6, wherein, The illumination light source irradiates at least 4 illumination lights as the plurality of illumination lights to eyes of the user, the 4 illumination lights being opposite in a first direction and a second direction orthogonal to the first direction, respectively, The generating section generates the second guide mark that guides an interval between 2 illumination lights opposing in the first direction and an interval between 2 illumination lights opposing in the second direction to be the predetermined value.
8. The image projection apparatus of claim 1, wherein, The image projection apparatus includes an illumination light source mounted on a frame worn by the user together with the projection unit and the imaging unit, and configured to irradiate a plurality of illumination lights to eyes of the user, The generating section generates the superimposed image that displays a center position of the pupil photographed in the photographed image based on positions of the plurality of illumination lights photographed in the photographed image.
9. The image projection apparatus of claim 8, wherein, The illumination light source irradiates at least 4 illumination lights as the plurality of illumination lights to eyes of the user, the 4 illumination lights being opposite in a first direction and a second direction orthogonal to the first direction, respectively, The generating section sets an intersection point at which a straight line passing through centers of the 2 illumination lights opposing in the first direction and a straight line passing through centers of the 2 illumination lights opposing in the second direction intersect as a position based on the plurality of illumination lights.

Description

Image projection apparatus Technical Field The present invention relates to an image projection apparatus. Background An image projection apparatus is known which directly projects an image onto a retina of a user using light emitted from a light source, and which uses maxwell's observation method. In maxwell's observation, an image is projected onto the retina by converging a plurality of light rays forming the image in the eye of a user and then irradiating the light rays onto the retina. In an image projection apparatus using maxwell's observation, since an image is not projected onto the retina when light does not pass through the pupil, a method in which light continues to pass through the pupil even in the case where the pupil moves has been proposed (for example, patent document 1). Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2023-76137 Disclosure of Invention Problems to be solved by the invention When the user wears the image projection apparatus, it is preferable that the pupil is located at a predetermined position corresponding to a convergence point at which a plurality of light rays are converged in the eye, but sometimes deviated from the predetermined position. In order to match the position of the pupil with a predetermined position, for example, a method of guiding the pupil by sounding a sound of a size corresponding to the amount of deviation from the predetermined position is considered. However, it is difficult to adjust the position because it is not known in which direction the sound is shifted only by the size of the sound. As another method, a method of guiding by voice prompt is considered, but in this method, since the position of the pupil changes during broadcasting, there is a case where delay occurs in voice guidance. The present invention has been made in view of the above-described problems, and an object of the present invention is to easily align the position of the pupil with a predetermined position. Means for solving the problems The invention provides an image projection device which comprises a projection unit including a scanning unit for scanning light emitted from a light source and a projection optical system for converging a plurality of light rays emitted from the scanning unit in different directions by the scanning unit to converging points in eyes of a user and projecting the converging points onto retina to project an image onto the retina, an imaging unit for imaging the eyes of the user, a generation unit for generating an overlapping image in which the imaged image of the eyes of the user imaged by the imaging unit is overlapped with a reference image, wherein the reference image shows a position at which the pupils of the user should be aligned, and a projection control unit for controlling the projection unit to project the overlapping image onto the retina. In the above configuration, the generation unit may generate a first guide mark that guides the user's pupil to coincide with the position based on the center position of the pupil of the user captured in the captured image and the position in the reference image, and the projection control unit may control the projection unit to project the first guide mark onto the retina. In the above structure, the first guide mark is an arrow. In the above configuration, the projection section and the photographing section are mounted on a frame worn by the user. In the above configuration, the image projection apparatus may further include an illumination light source mounted on a frame worn by the user together with the projection unit and the photographing unit, the generation unit may generate a second guide mark for guiding intervals between the plurality of illumination lights photographed in the photographed image to be a predetermined value, and the projection control unit may control the projection unit to project the second guide mark onto the retina. In the above-described structure, the second guide mark is a color that varies according to the interval between the plurality of illumination lights. In the above-described configuration, the illumination light source irradiates at least 4 illumination lights as the plurality of illumination lights, which are respectively opposed in a first direction and a second direction orthogonal to the first direction, to the eyes of the user, and the generation section generates the second guide mark that guides an interval between 2 illumination lights opposed in the first direction and an interval between 2 illumination lights opposed in the second direction to be the predetermined value. In the above configuration, the image projection apparatus may include an illumination light source mounted on a frame worn by the user together with the projection unit and the photographing unit, the generation unit may generate the superimposed image in which a position based on the plurality of illumination lights phot