Search

CN-224202713-U - Reflection type large-caliber eccentric instrument

CN224202713UCN 224202713 UCN224202713 UCN 224202713UCN-224202713-U

Abstract

The embodiment of the invention relates to the technical field of reflective eccentrics, in particular to a reflective large-caliber eccentric. A reflection type large-caliber eccentric instrument comprises a light source, an illumination lens group, a cross reticle, a semi-reflection semi-transparent prism, a collimating lens group, a first spherical reflecting mirror and a second spherical reflecting mirror which are sequentially arranged along the direction of an optical main shaft, wherein the concave surface of the first spherical reflecting mirror faces the convex surface of the second spherical reflecting mirror, the first spherical reflecting mirror is provided with a central through hole allowing emergent parallel light of the collimating lens group to pass through, the convex surface of the second spherical reflecting mirror reflects the emergent parallel light of the collimating lens group for the first time to obtain primary reflected light, the concave surface of the first spherical reflecting mirror reflects the primary reflected light for the second time to obtain secondary reflected light, and the secondary reflected light can be converged on the optical main shaft to obtain a light converging point. The reflection type large-caliber eccentric instrument disclosed by the embodiment of the specification can be used for detecting the eccentricity of the measured lens with the large-caliber central hole.

Inventors

  • WANG JUN
  • WANG JIAN
  • WANG LING
  • TONG XIAOHONG
  • LIU JIA

Assignees

  • 杭州志达光电有限公司

Dates

Publication Date
20260505
Application Date
20250519

Claims (10)

  1. 1. The reflection type large-caliber eccentric instrument is characterized by comprising a light source (1), an illumination lens group (2), a cross reticle (3), a semi-reflection semi-transparent prism (4), a collimation lens group, a first spherical reflecting mirror (7) and a second spherical reflecting mirror (8) which are sequentially arranged along the direction of an optical main axis; The concave surface of the first spherical reflecting mirror (7) faces the convex surface of the second spherical reflecting mirror (8), and the first spherical reflecting mirror (7) is provided with a central through hole which allows the emergent parallel light of the collimating lens group to pass through; The convex surface of the second spherical reflector (8) reflects the emergent parallel light of the collimating lens group for the first time to obtain primary reflected light, the concave surface of the first spherical reflector (7) reflects the primary reflected light for the second time to obtain secondary reflected light, and the secondary reflected light can be converged on an optical main axis to obtain a light converging point (S); When the measured lens (9) is arranged between the second spherical reflecting mirror (8) and the light converging point (S), the center of the curvature radius of the measured surface of the measured lens (9) coincides with the light converging point (S), and at least part of the secondary reflected light can irradiate on the measured surface of the measured lens (9).
  2. 2. The reflective large caliber eccentric according to claim 1, wherein the concave radius of curvature of the first spherical mirror (7) is a x 200mm, the concave aperture diameter is a x 80mm, the convex radius of curvature of the second spherical mirror (8) is a x 30mm, the convex aperture diameter is a x 30mm, and the initial distance between the first spherical mirror (7) and the second spherical mirror (8) is a x 100mm, wherein a is a multiple value.
  3. 3. The reflective large caliber eccentric according to claim 2, wherein the concave radius of curvature of the first spherical mirror (7) is 200mm, the concave aperture diameter is 80mm, the convex radius of curvature of the second spherical mirror (8) is 30mm, the convex aperture diameter is 30mm, and the initial distance between the first spherical mirror (7) and the second spherical mirror (8) is 100mm.
  4. 4. A reflective large caliber eccentric according to claim 3, characterized in that the distance between the first spherical mirror (7) and the second spherical mirror (8) is adjustable, and the distance adjustable range is 85-105mm.
  5. 5. Reflective large caliber eccentric according to claim 4, characterized in that the second spherical mirror (8) is arranged on a sliding guide rail.
  6. 6. The reflective large-caliber eccentric instrument according to claim 1, wherein the illumination lens group (2) comprises a first plano-convex lens (2-1), a second plano-convex lens (2-2), a third plano-convex lens (2-3) and a fourth plano-convex lens (2-4) which are sequentially arranged along the optical axis direction, the convex surface of the first plano-convex lens (2-1) is opposite to and closely attached to the convex surface of the second plano-convex lens (2-2), and the convex surface of the third plano-convex lens (2-3) is opposite to and closely attached to the convex surface of the fourth plano-convex lens (2-4).
  7. 7. The reflective large-caliber eccentric instrument according to claim 1, wherein the collimating lens group comprises a first sub-lens group (5) and a second sub-lens group (6), the first sub-lens group (5) comprises a first meniscus lens (5-1) and a concave lens (5-2) which are sequentially arranged along the optical axis direction, and the second sub-lens group (6) comprises a second meniscus lens (6-1) and a biconvex lens (6-2) which are sequentially arranged along the optical axis direction.
  8. 8. The reflective large-caliber eccentric instrument according to claim 1, further comprising a spectroscope (10) arranged in cooperation with the semi-reflective semi-transparent prism (4), and a reticle (12), an imaging lens group (13) and a charge-coupled device (14) arranged in cooperation with the spectroscope (10).
  9. 9. The reflective large-caliber eccentric instrument according to claim 8, wherein the imaging lens group (13) includes a first biconvex lens (13-1), a biconcave lens (13-2), and a second biconvex lens (13-3) that are disposed in order in the optical axis direction.
  10. 10. The reflective heavy caliber eccentric according to claim 8, further comprising an eyepiece (11) cooperatively disposed with the beam splitter (10).

Description

Reflection type large-caliber eccentric instrument Technical Field The utility model relates to the technical field of reflective eccentrics, in particular to a reflective large-caliber eccentric instrument. Background A reflective decenter is a common instrument used to measure decentration of a lens or other optical element, where decentration refers to misalignment of the geometric center axis of the optical element with its optical principal axis. The working principle of the decentration detection is that light is irradiated onto a detected surface of a detected lens, and then the reflection condition of the detected surface to the light is observed to determine whether the detected lens is decentered or not. However, some measured lenses are provided with a central hole, and when the caliber of the central hole is larger (for example, greater than or equal to 30 mm), the eccentric detection of the measured lens cannot be performed by the reflective eccentric instrument in the prior art, because the light generated by the reflective eccentric instrument can completely pass through the central hole of the measured lens, and the light cannot form reflection on the measured surface of the measured lens. Disclosure of utility model Aiming at the problems existing in the prior art, the utility model provides a reflective large-caliber eccentric instrument which can perform eccentric detection on a measured lens with a large-caliber central hole. The utility model is realized by the following technical scheme: a reflection type large-caliber eccentric instrument comprises a light source, an illumination lens group, a cross reticle, a semi-reflection semi-transparent prism, a collimation lens group, a first spherical reflector and a second spherical reflector which are sequentially arranged along the direction of an optical main axis; The concave surface of the first spherical reflector faces the convex surface of the second spherical reflector, and the first spherical reflector is provided with a central through hole which allows the emergent parallel light of the collimating lens group to pass through; The convex surface of the second spherical reflector reflects the emergent parallel light of the collimating lens group for the first time to obtain primary reflected light, the concave surface of the first spherical reflector reflects the primary reflected light for the second time to obtain secondary reflected light, and the secondary reflected light can be converged on the optical principal axis to obtain a light converging point; When the measured lens is arranged between the second spherical reflecting mirror and the light converging point, the center of the curvature radius of the measured surface of the measured lens coincides with the light converging point, and at least part of the secondary reflected light can irradiate on the measured surface of the measured lens. Preferably, the concave curvature radius of the first spherical mirror is a×200mm, the concave aperture diameter is a×80mm, the convex curvature radius of the second spherical mirror is a×30mm, the convex aperture diameter is a×30mm, and the initial distance between the first spherical mirror and the second spherical mirror is a×100mm, where a is a multiple value. Preferably, the first spherical mirror has a concave radius of curvature of 200mm, a concave aperture diameter of 80mm, the second spherical mirror has a convex radius of curvature of 30mm, a convex aperture diameter of 30mm, and the first spherical mirror and the second spherical mirror have an initial distance of 100mm. Preferably, the distance between the first spherical reflecting mirror and the second spherical reflecting mirror is adjustable, and the distance adjustable range is 85-105mm. Preferably, the second spherical mirror is arranged on the sliding rail. Preferably, the illumination lens group includes a first plano-convex lens, a second plano-convex lens, a third plano-convex lens and a fourth plano-convex lens, which are sequentially arranged along the optical axis direction, wherein the convex surface of the first plano-convex lens is opposite to and closely attached to the convex surface of the second plano-convex lens, and the convex surface of the third plano-convex lens is opposite to and closely attached to the convex surface of the fourth plano-convex lens. Preferably, the collimating lens group comprises a first sub-lens group and a second sub-lens group, wherein the first sub-lens group comprises a first meniscus lens and a plano-concave lens which are sequentially arranged along the optical axis direction, and the second sub-lens group comprises a second meniscus lens and a biconvex lens which are sequentially arranged along the optical axis direction. Preferably, the reflection type large-caliber eccentric instrument further comprises a spectroscope matched with the semi-reflection semi-transparent prism, and a reticle, an imaging lens group and a charge