JP2013007937A - Full spectrum image observation device and color vision inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To project a clear image of a full spectrum by a simple constitution without generating a deviation of every picture element.SOLUTION: The full spectrum image observation device includes: a light source part 10 for emitting white light; a first diffraction grating 19 for generating diffraction light of white light; a DMD 22 for light-modulating and reflecting color-separated luminous flux; an RTIR prism 21 for guiding the luminous flux from the first diffraction grating 19 to the DMD 22 and also emitting reflected light from the DMD 22; a second diffraction grating 24 for generating the luminous flux formed to a desired distribution with a full spectrum from the DMD 22, as adjusted and synthesized luminous flux; a galvano mirror 29 for scanning the luminous flux with deflection and making the luminous flux of each spectrum distribution to be two-dimensional by a time division; and an imaging optical system 30 including an eye-piece 31.

Description

  The present invention relates to a full spectrum image observation apparatus and a color vision inspection apparatus, and more particularly to a full spectrum image observation apparatus capable of obtaining a clear full spectrum image with a simple configuration, and a color vision inspection apparatus using the full spectrum image observation apparatus. About.

  Conventionally, it corresponds to a light source that emits white light, a continuous spectrum light forming unit that converts the white light emitted from the light source into spectral light that is continuously distributed in space, and each pixel of a full spectrum image to be displayed. A light valve (image forming element) that drives each pixel element that is secondarily arranged to time-modulate incident light, and spectral light scanning that cyclically scans continuous spectral light in one direction on the light valve. A projection type display device including a means is known (see Patent Document 1, Claim 1, and FIG. 1).

  Also, at least one light source configured to provide spectrally and spatially resolved light, and receiving and modulating the spectrally and spatially resolved light and selecting a spatial spectral distribution selected from the light source A spatial light modulator configured to selectively send a partial image set, and receive the set of partial images and scan the set of partial images over a display area to create a full spectrum image A scanning display device optical system and a scanning display device comprising a display system including at least one scanning device configured as described above are known (claims 1 and 1 of patent document 2). 2).

  Furthermore, the white light is demultiplexed into three colors of light of infrared light, green light, and blue light by a volume hologram element, a liquid crystal element, etc., and condensed into GLV (Grating Light Valve, Grating Light Vulb), Each color light is spatially modulated independently by the GLV, incident again on the volume hologram element, combined with the three color lights, scanned in a predetermined direction by a galvanometer mirror, and displayed in color on the projection surface. An image display device for projecting an image is known (see Patent Document 3, Abstract, Paragraph No. 0007). It is described that, for example, a liquid crystal panel, a DMD (Digital Micromirror Device), or the like is used as the spatial modulator.

  As a projection display device, light emitted from the exit surface of the rod integrator is incident on a relay lens having an aperture stop disposed at the pupil position, and then incident on a color separation optical system, modulated by a light valve, and emitted. The projection light is known to be incident on the projection lens and projected onto the screen (see Patent Document 4, paragraph numbers 0081 to 0091, FIG. 8).

  Furthermore, as a time-division video projection device, the light emitted from the light source passes through the condenser lens and transmissive color wheel, is reflected by the reflecting mirror via the rod lens and relay lens, and passes through the condenser lens and is reflected. There is a known one that is incident on and reflected by a type light modulation element and is enlarged and projected on a screen by a projection lens (see Patent Document 5, paragraph numbers 0046 to 0054 and FIG. 4).

  As a full-spectrum image observation device used as a projection device, white light emitted from a light source is converted into substantially parallel light by a reflector (parabolic mirror), and R light, G light, and B light are reflected by a reflective diffraction grating. Are separated into light fluxes corresponding to the respective wavelength ranges, reflected by three mirrors by a condenser lens, condensed by three reflective liquid crystal panels, and reflected respectively, and each of R light flux, G light flux, and B light flux. A light beam is guided to a projection optical system, and image information of three liquid crystal panels is synthesized and projected as a full-color image on a screen (see Patent Document 6, paragraph numbers 0124 to 0135 and FIGS. 10 and 11).

JP 2004-240293 A JP 2005-326837 A JP 2002-162573 A Japanese Patent No. 4175442 Japanese Patent No. 3335961 Japanese Patent No. 3335091

  However, the scanning display device optical system and the scanning display device described in Patent Documents 1 and 2 are synthesized with light of a wavelength not limited to R (red light), G (green light), and B (blue light). The specific optical system that slightly changes the degree of color to be displayed is not clearly and uniquely described, and it has been extremely difficult to realize. This is because there was a technical difficulty to realize with an actual device.

  Therefore, the conventional scanning display optical system and the scanning display cannot display an image in which each pixel has an arbitrary spectral distribution. For example, an ultra-high resolution image (high-definition image) that faithfully reproduces natural colors. ) Cannot be matched, and a three-dimensional full-color image that appears to have a greater depth cannot be displayed.

  Moreover, even if the image display technology by the galvanometer mirror of patent document 3, the aperture stop in the relay lens optical system of patent document 4, and the mirror scanning of patent documents 5 and 6 is combined with patent documents 1 and 2, the output of the rod integrator. Since the aperture stop is not provided at the end, there is a problem that the collimating lens on the subsequent optical path cannot be made into a parallel light beam, and the light beam cannot be efficiently focused.

  Further, the R, G, and B light beams obtained by separating white light cannot be projected onto the image display member, and may be shifted for each pixel, and the interval for each color pattern is disturbed. There is also a problem that a full-color clear image cannot be projected on the screen.

  Therefore, in the present invention, a full-spectrum image capable of projecting a clear image of a full spectrum with a simple configuration and by extending the optical path length to widen the color width and without causing a shift for each pixel. An object is to provide an observation apparatus and a color vision inspection apparatus.

According to the first aspect of the present invention, a light source unit that emits white light, a first spectral element that is generated as a spectral beam of the white light, and a light beam that is split by the first spectral element is optically modulated. Adjusting and combining the reflecting DMD, the RTIR prism that guides the light beam from the first diffraction grating to the DMD, and emits the reflected light from the DMD, and the light beam for which the full spectrum light amount from the DMD is determined A second spectroscopic element that is generated as a focused light beam, a galvanometer mirror that deflects and scans the adjusted and synthesized light beam to make a desired full spectrum light beam in a time-division two-dimensional manner, and an imaging position of the imaging optical system An imaging optical system including an eyepiece necessary for observing a full spectrum two-dimensional image formed in a plane with the naked eye, and forming the deflection-scanned light beam. It is a vector image observation device.
.

  According to a second aspect of the present invention, in the full spectrum image observing device according to the first aspect, the light source unit is an elliptical mirror, a light source that is arranged at one focal position of the elliptical mirror and generates white light, and the elliptical A brightness uniformizing element having an incident portion disposed at the other focal position of the mirror; a slit disposed at an exit portion of the brightness uniformizing element; and a collimating lens that collimates the narrowed light flux; and It is comprised from these.

  The invention according to claim 3 is the full-spectrum image observation apparatus according to claim 2, wherein the spectroscopic element is a diffraction grating.

According to a fourth aspect of the present invention, in the full spectrum image observation apparatus according to the third aspect, the diffraction grating is a reflection type diffraction grating.

  According to a fifth aspect of the present invention, in the full spectrum image observation apparatus according to any one of the first to fourth aspects, the characteristics of the light beam are changed by turning the galvano mirror by a predetermined angle to change the scan angle. It is characterized by.

  A sixth aspect of the invention includes the full-spectrum image observation apparatus according to any one of the first to fifth aspects, and a projection optical system disposed on the downstream side of the full-spectrum image observation apparatus. This is a color vision inspection device.

  A seventh aspect of the present invention is the color vision inspection apparatus according to the sixth aspect, further comprising a background pattern display device that displays a background pattern around an image projected by the projection optical system.

  According to the present invention, the light beam is narrowed by the slit provided at the light pipe exit end, the narrowed light beam is converted into a parallel light beam by the collimator lens, and incident on the reflection type diffraction grating, and the light beam dispersed by the diffraction grating is converted into the RTIR. The light beam is modulated and reflected from a fixed DMD, rotated by a prism, and a full spectrum light beam reflected by the diffraction grating is generated as an adjusted and synthesized light beam. The adjusted and synthesized light beam is imaged in a time-sharing manner by a galvanometer mirror. Since the image is formed for each pixel of the display member, the color width can be widened as a large optical path length, and the color pattern can be observed by the subject in an orderly manner without causing a shift for each pixel. A sharp image with a controlled spectrum can be projected.

It is a schematic diagram which shows the optical system of the full spectrum image observation apparatus which concerns on embodiment. It is a schematic diagram which shows the surface number of the optical system of the full spectrum image observation apparatus which concerns on embodiment. It is a figure which shows two-dimensional wavelength distribution when the angle | corner of the galvanometer mirror in the same full spectrum image observation apparatus is -2 degree | times. It is a figure which shows two-dimensional wavelength distribution when the angle | corner of the galvanometer mirror in the same full spectrum image observation apparatus is 0 degree | times. It is a figure which shows two-dimensional wavelength distribution when the angle | corner of the galvanometer mirror in the same full spectrum image observation apparatus is 2 degree | times. It is a schematic diagram which shows the distortion grating | lattice of a spot diagram. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a color vision inspection apparatus according to an embodiment, where (a) is a schematic diagram of an optical system, and (b) is a schematic diagram illustrating a screen image.

  Embodiments of a full spectrum image observation apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating an optical system of a full spectrum image observation apparatus according to an embodiment.

  The full spectrum image observation apparatus 100 is a light source unit 10 that emits white light, a first mirror 17 that reflects a light beam from the light source unit 10, and a collimator lens that uses the light beam from the first mirror 17 as parallel light. A first optical system 18, a first diffraction grating 19 that splits white light by diffraction, a second optical system 20 that converges the diffracted light from the first diffraction grating 19, and an incident light beam 45. An RTIR prism 21 that is rotated by a degree of rotation and a DMD 22 that is disposed on the RTIR prism 21 and that modulates and reflects light. The full-spectrum image observation apparatus 100 includes a third optical system 23 that is a relay optical system, a second diffraction grating 24 that is generated as a light beam obtained by adjusting and synthesizing a full-spectrum light beam from the DMD 22, and a second diffraction pattern. A second mirror 25 that reflects the diffracted light from the grating 24, a fourth optical system 26, a fifth optical system 28, a galvano mirror 29 that deflects and scans the light beams to time-divide the light beams of the respective colors, And a sixth optical system 30 that is an imaging optical system that forms an image of the light flux from the galvanometer mirror 29. Note that an eyepiece lens 31 is arranged in the sixth optical system 30.

  The light source unit 10 includes an elliptical mirror 11, a light source 12, a heat reflection filter 13, a converging lens 14 that converges a light beam, a light pipe 15, and a slit 16 disposed at an exit of the light pipe 15.

  The elliptical mirror 11 is a curved mirror whose reflecting mirror surface is a part of the inner surface of the spheroid. Further, as the light source 12, a xenon lamp having a flat spectral distribution in the visible region (400 to 700 nm) is used, and the light emitting unit is arranged at one of the two focal points of the elliptical mirror 11.

  The light pipe 15 is a hollow structure having, for example, four plane mirrors as wall surfaces. The entrance and the exit are rectangular. When light enters, the light pipe 15 is internally reflected and uniformed from the exit to reduce unevenness. Emits a luminous flux. Note that another uniformizing element such as a fly-eye array element can be used in place of the light pipe 15.

  The slit 16 is configured to have a predetermined slit width, and is disposed at the exit of the light pipe 15 to restrict the light flux from the light pipe 15.

  The light beam from the slit 16 is reflected by the first mirror 17 and converted into a parallel light beam by the first optical system 18.

  The first diffraction grating 19 is of a reflective type and emits the incident white light so as to have a continuous spectrum after color separation. The first diffraction grating 19 has a predetermined lattice constant, and emits the first-order diffracted light of 400 to 700 nm of white light toward the RTIR prism 21. The grating constant of the first diffraction grating 19 is determined in consideration of the size of the full spectrum image observation apparatus 100, the arrangement state of each element, etc., but in this embodiment, it is 600 / mm.

  The RTIR prism (Reverse Total Internal Reflection Prism) 21 includes a first prism 21a and a second prism 21b. An air layer is disposed between the first prism 21a and the second prism 21b. The light beam from the first mirror 17 passes through the first prism 21a, is optically modulated by the DMD 22, is totally reflected by the inner reflection surface of the second prism 21b, passes through the second prism 21b, and is passed through the third optical system. 23 is guided.

A DMD (Digital Mirror Device) 22 is a display element in which a large number of micromirror surfaces (micromirrors) are arranged in a plane, and optically modulates and reflects a light beam. The full-spectrum image observation apparatus 100 according to the embodiment uses a standard of 0.7 ″, XGA (1024 × 768 pixels).

  The DMD 22 modulates the light beam dispersed by the first diffraction grating 19 based on a modulation signal from the outside so as to be synchronized with the turning timing of the galvanometer mirror. The light beam modulated by the DMD 22 is guided to the second diffraction grating 24 by the third optical system 23.

The second diffraction grating 24 is of a reflective type and emits as a light beam obtained by adjusting and combining the light beams of the three primary colors from the DMD 22. That is, the second diffraction grating 24 synthesizes the modulated light flux so as to be synchronized with the turning timing of the galvanometer mirror. The second diffraction grating 24 has a predetermined grating constant and emits the first-order diffracted light of 400 to 700 nm of white light toward the RTIR prism 21. The grating constant of the diffraction grating 24 is determined in consideration of the size of the full spectrum image observation apparatus 100, the arrangement state of each element, etc., but in this embodiment, it is 600 lines / mm.

  The light beam from the second diffraction grating 24 is reflected by the second mirror 25 and guided to the fourth optical system 26.

  The galvanometer mirror 29 has a structure in which a mirror with a magnet is driven to swing at high speed and high accuracy by an external magnetic force generated by a coil or the like. The time-divided light beam scanned by the galvanometer mirror 29 is imaged by the sixth optical system 30 and is visually recognized by the observer through the eyepiece lens 31 as a two-dimensional spectrum image.

  The optical characteristic data of each surface of the optical system of the full spectrum image observation apparatus 100 according to the first embodiment is shown below. The surface data of 81 surfaces is written from the surface of the elliptical mirror 11 to the image forming element. The correspondence between main surface numbers and optical elements is shown in FIG.

RDY THI RMD GLA
OBJ: INFINITY 53.296050
1: INFINITY 0.000000
2: -20.30680 10.000000 SBSM16_OHARA
3: -32.59950 0.500000
4: 110.14800 4.600000 STIH4_OHARA
5: 35.90400 10.000000 SBAL35_OHARA
6: -45.29350 75.000000
STO: INFINITY 0.000000
8: INFINITY 0.000000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: 2.000000 BDE: 0.000000 CDE: 0.000000

9: INFINITY 0.000000 REFL
GRT:
GRO: -1.000000 GRS: 0.001667
GRX: 0.000000 GRY: 1.000000 GRZ: 0.000000
BLT: IDEAL

10: INFINITY 0.000000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: -2.000000 BDE: 0.000000 CDE: 0.000000

11: INFINITY 0.000000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: 14.000000 BDE: 0.000000 CDE: 0.000000

12: INFINITY -80.000000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: 4.140000 BDE: 0.000000 CDE: 0.000000

13: -78.49500 -9.000000 SLAM2_OHARA
14: 196.93950 -0.500000
15: -82.9740 -11.000000 SBSM16_OHARA
16: 61.19140 -10.000000 STIH4_OHARA
17 -129.95450 -17.600000
18: INFINITY -15.300000
19: INFINITY -12.496374 SBSM25_OHARA
20: INFINITY -0.060000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: -29.500000 BDE: 0.000000 CDE: 0.000000

21: INFINITY -28.116841 SBSM25_OHARA
22: INFINITY -1.000000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: 45.000000 BDE: 0.000000 CDE: 0.000000

23: INFINITY -2.997200 SFSL5_OHARA
24: INFINITY -0.482600
25: INFINITY 0.000000
XDE: -5.548850 YDE: -5.548850 ZDE: 0.000000
ADE: 0.000000 BDE: 0.000000 CDE: 0.000000

26: INFINITY 0.482600 REFL
UDS:
UCO
C1: 1.5030E-01 (X slope)
C2: 1.5030E-01 (Y slope)
UMR
UDS: cv_uds_dmd

27: INFINITY 2.997200 SFSL5_OHARA
28: INFINITY 0.500000
29: INFINITY 34.00000 SBSM25_OHARA
30: INFINITY -6.000000 TIRO SBSM25_OHARA
GL2:
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000 BEN
ADE: -45.000000 BDE: 0.000000 CDE: 0.000000

31: INFINITY -0.100000
32: INFINITY 0.000000
33: INFINITY -2.000000
34: INFINITY -3.000000 SBSL7_OHARA
XDE: -6.100000 YDE: 3.500000 ZDE: 0.000000
ADE: 0.000000 BDE: 0.000000 CDE: 0.000000

35: -40.49290 -6.200000
36: -256.93170 -2.500000 STIM22_OHARA
37: -35.09960 -17.500000 SLAM2_OHARA
38: 57.58970 -22.800000
39: 109.59120 -2.000000 SLAM7_OHARA
40: -45.50320 -13.300000 SBAH27_OHARA
41: 49.29690 -40.900000
42: INFINITY 0.000000
43: INFINITY 0.000000
44: INFINITY 0.000000
45: INFINITY 35.500000 REFL
GRT:
GRO: -1.000000 GRS: 0.001666
GRX: 0.000000 GRY: 1.000000 GRZ: 0.000000
BLT: IDEAL
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: 13.400000 BDE: 0.000000 CDE: 0.000000

46: INFINITY 27.600000
XDE: -15.900000 YDE: 5.800000 ZDE: 0.000000
ADE: 0.000000 BDE 0.000000 CDE: 0.000000

47: INFINITY -80.000000 REFL
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000 BEN
ADE: -40.000000 BDE: 0.000000 CDE: 0.000000

48: INFINITY -18.300000
49: -168.91720 -14.800000 SBSM15_OHARA
50: 168.91720 -0.500000
51: -88.48760 -27.000000 SBAL35_OHARA
52: 100.53100 -4.000000 STIH4_OHARA
53: INFINITY -0.100000
54: INFINITY -0.400000
55: -45.21594 -21.300000 'zeonex'
ASP: Aspheric coefficient
K: 0.624976
CUF: 0.000000
A:-. 137514E-04 B: 0.221825E-07 C:-. 195122E-10 D: 0.632800E-14

56: -467.57198 -0.500000
ASP: Aspheric coefficient
K: 7.983444
CUF: 0.000000
A:-. 364622E-05 B: 0.140081E-08 C: 0.957306E-12 D:-. 658460E-15

57: -73.29260 -3.000000 STIH4_OHARA
58: -20.00860 -15.282952
59: INFINITY -1.558020
SLB: "1-dim"
60: 10.84479 -11.949425 SBSM16_OHARA
XDE: -10.645342 YDE: 10.831096 ZDE: 0.000000
ADE: 0.000000 BDE: 0.000000 CDE: 0.000000

61: 15.43556 -37.579833
62: -176.54267 -2.975692
63: 531.49610 -15.497906
64: 105.38911 -2.500000 SLAM7_OHARA
65: -157.98731 -12.000000 SBAL35_OHARA
66: 43.27872 -152.341000
67: INFINITY 0.000000
XDE 0.000000 YDE: -11.817624 ZDE: 0.000000
ADE: 0.000000 BDE: 0.000000 CDE: 0.000000

68 INFINITY 0.000000 REFL
SLB: "galvano"
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000 DAR
ADE: 43.000000 BDE: 0.000000 CDE: 0.000000

69: INFINITY 0.000000
XDE: 0.000000 YDE: 0.000000 ZDE: 0.000000
ADE: 90.000000 BDE: 0.000000 CDE: 0.000000

70: INFINITY 30.000000
71: 66.27170 11.841930 SNBH8_OHARA
XDE: 9.282115 YDE: -0.407385 ZDE: 0.000000
ADE: 0.000000 BDE: 0.000000 CDE: 0.000000

72: 36.59345 8.000000 SBSL7_OHARA
73: -251.27323 93.900899
74: INFINITY 61.502564
75: 36.37720 12.000000 SFSL5_OHARA
76: -78.22252 1.836128
77: INFINITY 1.833844
78: INFINITY 2.346321
79: -63.51441 12.000000 SLAM7_OHARA
80: 43.94296 2.710030
81: INFINITY 0.100000
IMG: INFINITY 0.000000

  Here, the first optical system 18 is three lenses having surface numbers 1 to 6, and the total focal length of the three lenses is 93.87 mm. The second optical system 20 on the downstream side of the reflected light beam of the reflective first diffraction grating 19 is two lenses with surface numbers 13 to 17, and the total focal length of the two lenses is 70.04 mm. The third optical system that guides the light beam from the RTIR prism is composed of a cemented lens in which one lens having surface numbers 34 to 38 and two lenses are cemented, and two lenses having surface numbers 39 to 41 are cemented. The total focal length is 70.24 mm.

  The fourth optical system for guiding the light beam reflected by the reflection type diffraction grating and the reflection mirror is composed of lenses of surface numbers 49 to 58, and one biconvex lens, one biconvex lens and one surface are concave. It consists of a lens whose other surface is flat, a double-sided aspheric lens, a lens whose one surface is flat and the other surface is concave, and the total focal length is 93.6 mm.

  The fifth optical system for guiding the light beam from the fourth optical system is a lens having surface numbers 60 to 66, one lens having a concave surface and the other surface being convex, and one lens having a concave surface and the other surface. Is a cemented lens with a convex lens, and the total focal length is 109.2 mm. A sixth optical system that forms an image of the light beam reflected from the carbano mirror is a cemented lens in which two lenses having surface convex surfaces 71 to 73 are cemented, a biconvex lens having surface numbers 75 to 76, and surface numbers 79 to 79. It consists of three lenses with 80 biconcave lenses, and the total focal length is 84.4 mm.

  The double-sided aspherical lens having surface numbers 55 to 56 of the fourth optical system is an aspherical lens, and the aspherical coefficients are as described above.

  In this embodiment, the dimension of the effective area of the galvanometer mirror 29 is 30 mm × 52.7 mm and swings at a high speed between an angle of −2 ° and an angle of + 2 °. The angle of the galvanometer mirror 29 is a value based on the optical axis.

  In full-spectrum image observation apparatus 100, light beams pass in the order of blue, green, and red according to the scan of the galvanometer mirror. When viewed from the eyepiece, a full spectrum two-dimensional image can be visually recognized.

  The light from the eyepiece lens can be displayed on a screen (not shown) using an enlargement optical system (not shown).

  Next, the two-dimensional wavelength distribution (spot diagram) of the full spectrum image observation apparatus 100 according to the embodiment will be described. The vertical axis direction with respect to the galvanometer mirror 29 is set to a scan angle of 0 degree, the eyepiece lens side (downstream side of the irradiation optical axis) is the negative (−) direction of the scanning angle, and the opposite light source side (of the irradiation optical axis) The upstream direction is called the + (plus) direction of the scan angle.

  3 shows a two-dimensional wavelength distribution of a light beam when the scan angle is −2 °, FIG. 4 shows a two-dimensional wavelength distribution of the light beam when the scan angle is 0 °, and FIG. 5 shows a scan angle of +2. FIG. 6 is a schematic view showing a distorted grating of a spot diagram. FIG.

  3, 4, and 5 are spot diagrams at points (1) to (9) of the two-dimensional display pattern obtained by scanning the galvanometer mirror (effective area: 14 mm × 18.7 mm) shown in FIG. 6. Indicates. The numerical value shown on the left side of each spot diagram is the coordinate value on the image formed by the eyepiece, and the numerical value shown on the right side of the spot diagram shows the size of the spot spread. Yes.

  All aberrations such as spherical aberration, chromatic aberration and distortion are shown. The horizontal axis indicates the tilt angle of the galvanometer mirror, the center is 0 degrees, the left is -2 degrees, and the right is +2 degrees. The coordinate values on the eyepiece (the values on the left side of FIGS. Are plotted according to the X coordinate value and the lower row is the Y coordinate value).

  As shown in FIGS. 3, 4, and 5, the full spectrum image observation apparatus 100 according to the embodiment is a high-performance projection optical system that can be favorably corrected. The numerical values described on the left side of each spot diagram are the coordinate values on the eyepiece lens (the upper coordinate is the X coordinate value, the lower is the Y coordinate value), and the numerical values described on the right side of the spot diagram diagram. Represents the average of all aberrations such as spherical aberration, chromatic aberration, distortion, etc. in RMS, and indicates what percentage the chromatic aberration is 100%.

  It shows that all aberrations such as spherical aberration, chromatic aberration, and distortion are suppressed to 0.10% or less, and chromatic aberration is also suppressed to 0.40% or less. The lower side of the spot diagram indicates spherical aberration, and indicates that spherical aberration is suppressed within 0.25 mm.

  As described above, the full spectrum image observation apparatus 100 according to the present embodiment can obtain a full spectrum image with a simple optical system.

  Next, the color vision inspection apparatus according to the embodiment will be described. 7A and 7B show a color vision inspection apparatus according to the embodiment. FIG. 7A is a schematic diagram of an optical system, and FIG. 7B is a schematic diagram showing a screen image. Conventionally, in a color vision inspection, only an image that is displayed in color in a state where the periphery is black is displayed. For this reason, accurate color vision inspection may not be possible. This is considered to be because the impression received from the image when displayed in color in a black surrounding is completely different from the impression received from the image when displayed in color with the periphery displayed in a bright color. It is done.

  Therefore, the color vision inspection apparatus 300 according to the present embodiment displays an inspection pattern 331 having a two-dimensional color distribution on the screen 330 and displays a background pattern 332 of a predetermined color around the inspection pattern 331.

  The color vision inspection apparatus 300 according to this embodiment includes the full-spectrum image observation apparatus 100 described above, and a relay lens 311 that creates an intermediate image of an inspection pattern created on an eyepiece that is the outermost optical system of the full-spectrum image observation apparatus 100. A diffusing plate 320 as a background pattern display device for creating the background pattern 332 and a second relay lens 312 are arranged.

  The diffusion plate 320 is disposed between the relay lenses 311 and 312 and is irradiated with illumination light 340 of a predetermined color. The illumination light 340 may be monochromatic light or may be a color freely created with a programmable light source. Further, although the inspection pattern is described with a two-dimensional color distribution, it can be a one-dimensional color distribution.

  In this color vision inspection apparatus 300, the inspection image formed by the eyepiece 31 of the sixth optical system 30 forms an intermediate image by the relay lens 311, and this intermediate image is again formed on the diffusion plate 320 by the relay lens 312. In addition, the diffusion image of the illumination light 340 irradiated on the diffusion plate 320 is projected around the inspection pattern 331 as the background pattern 332 by the relay lens 312. Note that the color vision inspection apparatus 300 can be the color vision inspection apparatus 300 according to the second embodiment using a reflection type image forming element instead of a transmission type image forming element.

  According to the color vision inspection apparatus 300 according to the present embodiment, according to the present invention, it is possible to perform color vision inspection even when an image is displayed in a color in a state where the periphery is displayed in a bright color, and whether color vision is normal or abnormal. Can be accurately inspected.

DESCRIPTION OF SYMBOLS 10 Light source part 11 Elliptical mirror 12 Light source 13 Heat reflection filter 14 Converging lens 15 Light pipe 16 Slit 17 1st mirror 18 1st optical system 19 1st diffraction grating (1st spectroscopy element)
20 Second optical system 21 RTIR prism 21a First prism 21b Second prism 22 DMD
23 Third optical system 24 Second diffraction grating (second spectroscopic element)
25 Second mirror 26 Fourth optical system 27 Aspherical lens 28 Fifth optical system 29 Galvano mirror 30 Sixth optical system (imaging lens)
31 Eyepiece 100 Full spectrum image observation device 300 Color vision inspection device 311 Relay lens 312 Second relay lens 320 Diffuser plate 330 Screen 331 Inspection pattern 332 Background pattern 340 Illumination light 311, 312 Relay lens

Claims (7)

A light source that emits white light;
A first spectroscopic element that is generated as a spectral beam of the white light;
DMD for optically modulating and reflecting the light beam dispersed by the first spectroscopic element;
An RTIR prism that guides the light beam from the first diffraction grating to the DMD and emits the reflected light from the DMD;
A second spectroscopic element that generates a luminous flux obtained by adjusting and synthesizing a luminous flux whose full spectrum light amount from the DMD is determined;
A galvanometer mirror that deflects and scans the adjusted and combined luminous flux to make a desired full-spectrum luminous flux time-divisionally two-dimensional;
An imaging optical system that includes an eyepiece necessary for observing a full spectrum two-dimensional image formed in a plane including an imaging position of the imaging optical system with the naked eye, and forms the deflection-scanned light beam And a full-spectrum image observation device. The light source unit is
An elliptical mirror,
A light source arranged at one focal position of the elliptical mirror to generate white light;
A luminance uniforming element having an incident portion disposed at the other focal position of the elliptical mirror;
A slit arranged at the exit of the brightness uniformizing element, for narrowing the luminous flux;
A collimating lens that collimates the narrowed light beam;
The full-spectrum image observation apparatus according to claim 1, comprising:   The full spectrum image observation apparatus according to claim 1, wherein the spectroscopic element is a diffraction grating.   The full-spectrum image observation apparatus according to claim 3, wherein the diffraction grating is a reflective diffraction grating.   The full spectrum image observation apparatus according to any one of claims 1 to 4, wherein the characteristics of the light beam are changed by turning the galvanometer mirror by a predetermined angle to change a scan angle.   A color vision inspection apparatus comprising: the full spectrum image observation apparatus according to any one of claims 1 to 5; and a projection optical system disposed on the downstream side of the full spectrum image observation apparatus. The color vision inspection apparatus according to claim 6, further comprising a background pattern display device that displays a background pattern around an image projected by the projection optical system.