JP2003140081A - Hologram combiner optical system - Google Patents

Hologram combiner optical system

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Publication number
JP2003140081A
JP2003140081A JP2001340992A JP2001340992A JP2003140081A JP 2003140081 A JP2003140081 A JP 2003140081A JP 2001340992 A JP2001340992 A JP 2001340992A JP 2001340992 A JP2001340992 A JP 2001340992A JP 2003140081 A JP2003140081 A JP 2003140081A
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JP
Japan
Prior art keywords
optical system
hologram
combiner
optical
element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001340992A
Other languages
Japanese (ja)
Inventor
Kenji Hori
Yumiko Ouchi
健治 堀
由美子 大内
Original Assignee
Nikon Corp
株式会社ニコン
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikon Corp, 株式会社ニコン filed Critical Nikon Corp
Priority to JP2001340992A priority Critical patent/JP2003140081A/en
Publication of JP2003140081A publication Critical patent/JP2003140081A/en
Application status is Pending legal-status Critical

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Abstract

(57) [Problem] To provide a hologram combiner optical system capable of suppressing chromatic aberration regardless of monochromaticity of a light source and wavelength selectivity of a HOE. A hologram combiner optical system in which a hologram element that guides both light from a predetermined image display element and light from the outside to a user's eyes is provided, wherein the hologram element with respect to the optical power of the entire optical system is provided. Is less than one. By allocating optical power to surfaces other than the hologram element in this way, and by reducing the amount of optical power allocated to the hologram element, which generally causes chromatic aberration, the chromatic aberration of the entire hologram combiner optical system is reduced. Can be

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a predetermined image display element.
A light that guides both the light from the child and the light from the outside world to the user's eyes.
Hologram combiner optical system with program elements
Related. 2. Description of the Related Art A hologram combiner device is an LCD or the like.
Which image display element and hologram combiner optical system
Prepare. The user uses this hologram combiner device.
The image displayed by the image display device and the external world
You can see the scenery overlaid. A hologram combiner optical system generally includes:
Substrate consisting of a parallel plate that allows light from the outside
Gram substrate), and placed inside the substrate, and the image
Each light from the display element is deflected in a predetermined direction.
Holographic element (HOE; Holographic O)
ptical Element). Where HOE is diffraction
Governs the direction of light traveling by other optical elements (eg
(For example, refractive optical system and reflective optical system)
A wavefront conversion action that requires
(Lamb surface). As a result,
The size of the program combiner device can be reduced. [0004] However, the HOE has a smaller size than other optical elements.
Large dispersion and easy chromatic aberration to occur.
So, the color of the displayed image is blurred to the user
It may look like. To minimize this chromatic aberration
For hologram combiners, high wavelength selection
Volume hologram element known for its selectivity
Is considered suitable. [0005] However, two-dimensional
The light rays from each position in the image have different angles of incidence.
Therefore, even if it is a volume hologram element,
To maintain high diffraction efficiency for all rays,
It is difficult to correct axial chromatic aberration and off-axis chromatic aberration simultaneously.
No. Therefore, it is extremely difficult to express the entire area of the image in a good manner.
It is difficult. This means that if D has negative optical power,
The same applies even when an OE (diffractive optical element) is combined.
You. For this reason, conventionally, the entire area of a two-dimensional image has been
In order to display well, the light of the hologram combiner
It is necessary to set restrictions on the side of the source (light source of the image display element)
there were. This limitation is due to the use of a laser as the light source,
The monochromaticity of the light source must be improved.
You. However, at present, the wavelength width of the light source is about ± 1 nm.
Chromatic aberration cannot be sufficiently suppressed.
No. [0007] Accordingly, the present invention provides a monochromaticity of the light source and an HOE.
Holog that can suppress chromatic aberration regardless of wavelength selectivity
An object of the present invention is to provide a ram combiner optical system. [0008] The hologram according to claim 1
The ram combiner optical system controls the light from a predetermined image display element.
Hologram element that guides both the light from the outside and the outside world to the user's eyes
Hologram combiner optical system with
Of the hologram element with respect to the optical power of the entire system
The ratio of optical power is less than one. In this manner, the optical power is changed to a hologram.
Allocated to surfaces other than the element, generally easily causing chromatic aberration
Reduces the amount of optical power allocated to hologram elements
The chromatic aberration of the entire hologram combiner optical system
Is suppressed. The hologram combine according to claim 2.
The hologram combiner light according to claim 1, wherein the optical system is a hologram combiner light.
In a scientific system, the ratio of the optical power is less than 1 and 0
It is characterized by the above. [0010] The hologram combiner light according to claim 3.
The holographic computer according to claim 1 or 2,
In the binar optical system, the incident angle and exit angle of the chief ray
The hologram elements are arranged so that
It is characterized by that. The hologram component according to claim 4.
Whether the light from a given image display device and the outside world
A hologram element that guides both light to the user's eyes
Hologram combiner optical system,
The diffraction surface of the ram element is on a curved surface with positive optical power.
It is characterized by being formed in. [0011] The hologram combiner light according to claim 5.
The hologram combiner optical system according to claim 4, wherein:
The optical power of the whole hologram element
The ratio of the optical power due to the curved surface is less than 5.
It is characterized by the following. The hologram converter according to claim 6.
The holographic optical system according to claim 4 or 5, wherein the inner optical system is a holographic optical system.
The optical power of the entire optical system
The ratio of the optical power of the hologram element to
It is characterized by being less than 1. The hologram combiner light according to claim 7.
The hologram combiner optical system according to claim 6, wherein
Wherein the ratio of the optical power is less than 1 and not less than 0.
There is a feature. The hologram core according to claim 8.
The combiner optical system according to any one of claims 4 to 7,
In the hologram combiner optical system described in FIG.
The hologram so that the incident angle and the exit angle are approximately equal.
A memory element is disposed. A hologram combiner according to claim 9
Academic systems use light from a given image display device and light from the outside world.
With a hologram element that guides both to the user's eyes
Gram combiner optics with positive optical power
The refractive and / or reflective optical systems
And features. The hologram converter according to claim 10.
The hologram combiner according to claim 9, wherein the inner optical system is a hologram combiner.
In an optical system, the refractive optical system and / or the reflective optical system
Transmits light from the image display element to the hologram element.
Also serves as an optical system for guiding light from the image display device.
When the optical axis is included in the horizontal plane, the image display element
Light guided from the element and diffracted by the hologram element
Optical axis is also included in the horizontal plane
It is characterized by. A hologram combiner according to claim 11,
The hologram according to claim 9 or 10, wherein the optical system is a hologram.
In the combiner optical system, the refractive optical system and / or
The reflecting optical system is composed of a plurality of optical surfaces,
Light of the first optical surface arranged on the side closest to the image display element
The biological power is set to be negative. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
An embodiment will be described. [First Embodiment] FIG.
The first embodiment will be described. FIG. 1 shows this embodiment.
Of hologram combiner optical system and optical path (display
FIG. 7 is a diagram illustrating only an optical path from a plane D). Hologram con
The binar optical system 11 is an image table composed of a transmissive LCD or the like.
Disposed between the display surface D of the display element and the pupil P of the user's eye.
You. Exit pupil of hologram combiner optical system 11
Substantially matches the pupil P of the user's eye. Keep this
Therefore, the hologram combiner optical system 11 includes, for example,
Through a support member (not shown) similar to the eyeglass frame,
It is mounted on the user's head together with the image display element. FIG. 1 shows a hologram combiner light for the left eye.
This shows the academic system 11 viewed from above the user.
You. Hereinafter, XYZ rectangular coordinates as shown in the figure are defined.
You. The origin of these coordinates is the center of the pupil P, and
The Z direction (rightward on the paper) is the optical axis direction of the user's eye,
The Y direction (upward on the paper) is the right / left direction of the user, and X
The direction (front and back of the paper) is the vertical direction of the user (vertical direction).
(The hologram combiner optical system 1)
1 has a symmetrical shape with respect to the YZ plane. ). Now, the hologram combiner of the present embodiment
The optical system 11 includes a hologram element (HOE) 17
From the hologram substrate 15 and the correction optical system 18.
You. The hologram substrate 15 guides light from the outside world to the eyes.
To be placed parallel to the XY plane (ie, facing the eye)
Parallel (as placed) transparent glass or plastic
It consists of a flat plate or the like. Alternatively, at least the hologram substrate 15
One surface (the surface 15a on the user side or the surface 1 opposed thereto)
5b) has optical power for correcting vision of the user's eye
(Hereinafter, for simplicity, parallel flat
Board. ). By the way, the display surface D of the image display device is
It does not hinder the user from observing the outside world and
Hologram substrate 1 so as not to interfere with
5, the directions of “−Z” and “+ Y”, that is,
It is arranged on the left front side of the user. Incidentally, in the present embodiment, the image display element
The arrangement position is set in the lateral direction of the user's eye (in FIG.
The left side of the left eye), the optical axis of the display surface D
(In FIG. 1, in the same YZ plane as the optical axis of the eye)
I have. The correction optical system 18 has such an arrangement.
Light from the display surface D of the hologram substrate 15 is
Catadioptric optical system for guiding the incident surface 15c on the left side of 5a
It is. It should be noted that the correction optical system 18 of the present embodiment
Has a positive optical power as a whole,
Thereby, the chromatic aberration of the hologram combiner optical system 11 is
Function is also performed (details will be described later).
You. ). For example, the correction optical system 18 includes a triangular prism and
It is a reflection and refraction optical system having almost the same shape.
In order from the side, the refraction surface 18a, the reflection surface 18b, and the refraction surface 18
c is arranged. The reason why the surface 18b is used as a reflecting surface is as follows.
The display surface D at a position where it does not interfere with the person's face
That's because. By the way, the correction optical system having such a configuration
18 is shown in FIG. 1 despite being a single optical element.
Display surface D placed away from the optical axis of the eye
From the light to the incident surface 15c of the hologram substrate 15.
This is advantageous in that The hologram substrate 15 has an incident surface
The hologram substrate 1 converts the light beam that has entered substantially perpendicularly from
5 in the directions of “−Y” and “−Z”
Reflecting surface that reflects (so as to be obliquely incident on the side surface 15a)
15d is formed. Next, inside the hologram substrate 15
The HOE 17 provided in the camera is, for example, a reflection volume type hologram.
(Hereinafter referred to as a reflection volume hologram element).
You. ). The HOE 17 is provided with a hologram
A position facing the user's eye inside the substrate 15
You. In addition, the surface on which the HOE 17 is formed has surfaces 15a, 15a.
b, the angle of inclination of which is
And the light traveling inside the hologram substrate 15
It is set to be incident on the HOE 17. Moreover, in the present embodiment, this arrangement angle
Is such that the incident angle and the exit angle of the chief ray are approximately equal.
Is set. By setting in this way, HOE1
7 can be minimized.
The shape of the HOE 17 on the hologram substrate 15
For example, the hologram is formed along the surface where the HOE 17 is to be placed.
Gram substrate 15 is cut once, and HOE 17 is placed between them.
The adhesive (the refractive index of which is between the hologram substrate 15 and
They have substantially the same refractive index. ). The peak wavelength of the diffraction efficiency of HOE17
Is the wavelength of the light emitted from the display surface D (that is, the light source wave).
Long) peak wavelength. The display surface D
Is a color image, and the light source wavelength is R
There are three kinds of peak wavelengths corresponding to color, G color and B color
Sometimes three diffraction patterns are formed for three wavelength bands
Is done. That is, the peak wavelength of the diffraction efficiency is the wavelength of R color.
Diffraction pattern and diffraction efficiency peak
A diffraction pattern whose wavelength substantially matches the wavelength of the G color;
The peak wavelength of the diffraction efficiency almost coincides with the wavelength of B color
The diffraction pattern is superimposed. A hologram containing the HOE 17
A predetermined optical power is given to the combiner optical system 11.
Have been. Hologram combiner optical system with the above configuration
11, a light beam emitted from an arbitrary point on the display surface D
Are the refracting surface 18a, the reflecting surface 18b of the correcting optical system 18,
After sequentially entering the refraction surface 18c, the hollow
After entering the gram substrate 15 and reflecting the reflection surface 15d,
The surface 15a and the surface 15b arranged in parallel to each other are sequentially repeated.
Reflected back and then diffracted at HOE17
Of the hologram substrate 15 from the surface 15a of the gram substrate 15
Inject outside, i.e. towards the user's eyes. The emitted light beam is used as a hologram combiner.
The optical system 11 receives a predetermined optical power and
It is converted to a state close to a light beam. Therefore, the user's eye
The display surface D appears to be more distant than
You. Here, in the conventional hologram combiner optical system,
So, the optical power to look like this is all
Provided by the diffraction pattern of HOE17
Was. However, the hologram combiner of the present embodiment
In the optical system 11, the hologram combiner optical system
HOE 17 optical to 11 total optical power
The power ratio is kept below 1. In other words, hologram
Of the total optical power of the mucom combiner optical system 11,
The burden on the HOE 17 is kept small. Then, regarding the remaining optical power,
Other optical surfaces of the hologram combiner optical system 11, for example
In this case, the optical surface in the correction optical system 18 is burdened (see the above description).
As described above, the positive optical power is given to the correcting optical system 18.
That is why. ). In this way, HOE1
If the optical power allocated to 7 is reduced, the incident light
The diffraction angle to be given to the ray (more precisely, the diffraction angle of the chief ray)
(The difference between the angle and the diffraction angle of the marginal ray) is suppressed.
The chromatic aberration that tends to occur in HOE17
Can be suppressed. On the other hand, the correcting optical system 18 is a catadioptric optical system.
System, so even if it has optical power
However, chromatic aberration is less likely to occur than in the HOE 17.
Therefore, the hologram combiner optical system of the present embodiment
11, the overall chromatic aberration is suppressed. By the way, conventional e
Programmable combiner optics to reduce chromatic aberration
In addition, the restrictions on the monochromaticity of the light source were severe. But,
In the hologram combiner optical system 11 of the present embodiment,
As described above, chromatic aberration is suppressed, so it is the same as before
For performance, the constraints on the monochromaticity of the light source are:
Become gentle. In addition, a light source with the same wavelength width
If used, its performance will be higher than before. A conventional hologram combiner optical system
Then, in order to suppress chromatic aberration, the wavelength selectivity of HOE17
Was severely restricted. However, in this embodiment,
In the Gram combiner optical system 11, chromatic aberration is suppressed.
So, if you want to get the same performance as before,
The restrictions on the wavelength selectivity are less strict than before. Ma
Also, since HOE with the same wavelength selectivity as the conventional one is used,
If so, its performance will be higher than before. The hologram combiner of the present embodiment
In the optical system 11, the hologram combiner optical system 1
The optical power of HOE 17 for the total optical power of
The power ratio is desirably 0 or more. Because
When the ratio of the optical power is smaller than 0,
Compared to a certain time, (even if the same optical power
Even if it is applied to achieve the same viewing angle)
The required effective diameter can be kept small.
You. If the effective diameter can be reduced, the hologram substrate 15
It is easier to store the light beam in the part (easy to fold), as a result,
It is possible to keep the thickness of the hologram substrate 15 thinner
Because it becomes. [Specific Example of First Embodiment]
Hologram combiner optical system lens
Table 1, Table 2, and Table 3 show the size data. This hologram
The specifications of the combiner optical system are as follows. Sandals
The entrance pupil diameter is 3 mm, and the angle of view is ± 6.6 in the X direction.
It is ± 5 ° in the 6 ° Y direction. Also, the appearance to the object
The distance is -600.000000mm and the wavelength used is
524.44 nm, 514.44 nm, 504.44 n
m. It should be noted that the order of the surface numbers is as follows from the pupil P to the display surface D.
To the direction to. Also, this hologram combiner optics
The system uses a HOE diffraction pattern to display color images.
3 types are prepared. The above-mentioned wavelength band (525 nm to
Wavelength bands other than the first wavelength band near 504 nm (63)
Second wavelength band in the vicinity of 6 nm to 615 nm, 472 nm to 4
HOE data for the third wavelength band near 51 nm)
Are shown in Tables 4 and 5. The wavelength used in the HOE data shown in Table 4
Are 635.65 nm, 625.65 nm, 615.6
5 nm, and the working wavelength of the HOE data shown in Table 5 is:
471.26 nm, 461.26 nm, 451.265
nm. Also, the PMMA used in this specific example
The refractive index for each wavelength is as follows. That is, for a wavelength of 471.26 nm
Refractive index is 1.609033, wavelength 461.26nm
Refractive index is 1.610667, wavelength 451.26 nm
Has a refractive index of 1.612429 and a wavelength of 524.44.
The refractive index for nm is 1.602032, wavelength 514.
The refractive index for 44 nm is 1.603167, wavelength 50
The refractive index for 4.44 nm is 1.604378, wavelength
The refractive index for 635.65 nm is 1.593141;
The refractive index for a wavelength of 625.65 nm is 1.59371.
1. The refractive index for a wavelength of 615.65 nm is 1.594.
316. The PMM used in a specific example described later
The characteristics of A are the same as those of the PMMA of this specific example.
The same. In the notation of HOE data, “HV
"1" is an object point light source, "HV2" is a reference point light source, "HT
"H" is the thickness of the HOE, "HIN" is the refractive index of the HOE,
“HDI” is the modulation width of the HOE refractive index, “HSW” is the HO
E thickness expansion coefficient, "HDN" is HOE refractive index shift,
“HX1” is the X coordinate of the object point light source, “HY1” is the object point
The light source Y coordinate, "HZ1" is the Z coordinate of the object point light source, "H
“X2” is the X coordinate of the reference point light source, and “HY2” is the reference point light source
“HZ2” is the Z coordinate of the reference point light source, “HW
“L” is a light source wavelength (unit: nm) at the time of manufacturing the HOE. In Tables 4 and 5, "HOR" is
Diffraction order, “XDE” is shift amount in X direction, “YDE”
Is the shift amount in the Y direction, and "ZDE" is the shift amount in the Z direction.
is there. In each table, parentheses corresponding to each surface number
The reference numerals in the parentheses are the reference numerals assigned to each surface in the figure. [Table 1] [Table 2] [Table 3] [Table 4] [Table 5] Incidentally, in this specific example, the hologram combiner optical system
11 total optical power (focal length 16.0mm)
Optical power of HOE17 (focal length 21.0 m
The ratio of m) is 0.76. In this specific example, the HOE 17
The incident angle and the exit angle of the principal ray with respect to
9.30000 ° and 29.3132 °. In addition,
.., C65 in the HOE data
The phase function of the HOE defined by
(The same applies to embodiments described later.) By the way, the general phase function is HOE17
Light received by a ray incident on a position on the XY plane and a specified point
The path difference is expressed by being normalized by the wavelength used.
expressed. There are 65 coefficients of this phase function, and
C1, C2, C3, ..., C65 and the order of the coefficients
Is represented by an integer j (j = 1, 2,..., 65).
The relationship between j and the integers m and n is given by equation (2). ), Equation 3
expressed. The definition of such a phase function will be described later.
HOE data in Tables 6, 8, and 10
The same is true for However, in each table, the phase coefficient is 0.
Is not shown. (Equation 1) (Equation 2) [Equation 3] Also, the aberration diagram of this hologram combiner optical system is
2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG.
0. FIGS. 2, 3 and 4 show the first wavelength band.
FIGS. 5, 6, and 7 show aberration diagrams of the second wavelength band.
FIGS. 8, 9, and 10 show aberration diagrams for the third wavelength band.
It is an aberration figure. In each figure, "Y-FAN" is the Y direction
Direction, "X-FAN" is the X direction, "FIELD HEIG"
"HT" indicates the angle of view (the angle in the X direction and the angle in the Y direction).
You. [Second Embodiment] The present invention will be described with reference to FIG.
The second embodiment will be described. FIG. 11 shows this embodiment.
Of hologram combiner optical system and optical path (display
FIG. 7 is a diagram illustrating only an optical path from a plane D). Here, the first
Only the differences from the embodiment will be described, and other
Explanation is omitted. The hologram combiner optical system of the present embodiment
21 is a hologram substrate 25 on which the HOE 27 is formed,
The optical system comprises correction optical systems 28 and 29. First, in the present embodiment,
The display surface D is different from the first embodiment in that the hologram substrate 1
5, the directions of “+ Z” and “+ Y”, that is,
It is located on the side opposite to the user's eye. The optical axis of the display surface D is the optical axis of the user's eye.
Exists in a predetermined plane parallel to the YZ plane as in
It has an angle of inclination with the optical axis of the eye. Also for correction
The optical systems 28 and 29 are arranged so that the optical system 28 and the
The light beam is incident on the incident surface formed on the left side of the hologram substrate 25.
25c is a refractive optical system that leads to 25c. The incident surface 25c
Is the side of the hologram substrate 25 close to the display surface D,
It is formed by cutting out substantially parallel to the display surface D.
You. In this embodiment, this correction
Optical systems 28 and 29 have a positive optical power as a whole.
Hologram combination.
The function of correcting the chromatic aberration of the optical system 21 is performed.
You. By the way, in the present embodiment, the correction optical systems 28 and 2
9, the surface 29a closest to the display surface D is a negative light.
Have a scientific power. By doing so, the hologram combiner
To improve the telecentricity on the incident side of the optical system 21
Can be. Also, some of the correction optical systems 28 and 29
If a surface with negative optical power is placed, the overall
Correction optical system to be provided with positive optical power
Is easily corrected. For example, the correction optical system 28,
29, the correction optical system 2 arranged on the display surface D side.
9 arranges concave surfaces 29a and 29b toward the display surface D in order.
Meniscus lens and the other correction optical system
Reference numeral 28 denotes a convex surface 28a and a flat surface 28b facing the display surface D in this order.
(Note that the plane 28b is
Without leaving a gap with respect to the incident surface 25c of the program substrate 25.
It is bonded and has no refractive effect. ). The hologram combiner optical system having the above configuration
21, a light beam emitted from an arbitrary point on the display surface D
Are the surfaces 29a and 29b of the correction optical system 29, and the correction optical system.
After sequentially entering the surfaces 28a and 28b of the system 28, the entrance surface 2
5c enters the hologram substrate 25 and the surfaces 25a, 25
b is reflected repeatedly in order, and then in HOE27
The hologram substrate 25 is diffracted to outside the hologram substrate 25, that is, the user's eye.
In the direction of. As described above, also in this embodiment, the first embodiment
In the same manner as described above, the optical power is supplied to the correction optical systems 28 and 29.
Optics that should be added to the HOE 27 by the burden
Hologram con
The overall chromatic aberration of the binar optical system 21 can be kept small. [Specific Example of Second Embodiment] Next, a specific example of this embodiment
The lens data of the hologram combiner optical system
The results are shown in Tables 6 and 7. Specifications of this hologram combiner optical system
Is as follows. That is, the entrance pupil diameter is 3 mm
The angle of view is ± 6.66 in the X direction and ± 5 ° in the Y direction.
is there. The apparent distance to the object is -600.000
000 mm, and the wavelength used is 524.44 nm, 51
4.44 nm and 504.44 nm. The surface number
In the direction from the pupil P to the display surface D. In the notation of HOE data, "H
“V1” is an object point light source, “HV2” is a reference point light source, and “HT”
"H" is the thickness of the HOE, "HIN" is the refractive index of the HOE,
“HDI” is the modulation width of the HOE refractive index, “HSW” is the HO
E thickness expansion coefficient, "HDN" is HOE refractive index shift,
“HX1” is the X coordinate of the object point light source, “HY1” is the object point
The light source Y coordinate, "HZ1" is the Z coordinate of the object point light source, "H
“X2” is the X coordinate of the reference point light source, and “HY2” is the reference point light source
“HZ2” is the Z coordinate of the reference point light source, “HW
“L” is a light source wavelength (unit: nm) at the time of manufacturing the HOE. "HOR" is the diffraction order, "XDE"
Is the shift amount in the X direction, "YDE" is the shift amount in the Y direction,
“ZDE” is a shift amount in the Z direction. In each table,
In the figure, the reference numbers in parentheses corresponding to the surface numbers
Is the code given to. [Table 6] [Table 7] Incidentally, in this specific example, the hologram combiner optical system
21 total optical power (focal length 13.7mm)
Optical power of HOE27 (focal length 20.2 m
The ratio of m) is 0.68. In this specific example, the HOE 27
The incident angle and the exit angle of the principal ray with respect to
9.30000 ° and 29.31404 °. Also,
The aberration diagram of this hologram combiner optical system is shown in FIG.
13 and 14. In each figure, "Y-
“FAN” is in the Y direction, “X-FAN” is in the X direction, and “FIE”
LD HEIGHT ”is the angle of view (the angle in the X direction,
Angle). [Third Embodiment] The present invention will be described with reference to FIG.
The third embodiment will be described. FIG. 15 shows this embodiment.
Of hologram combiner optical system and optical path (display
FIG. 7 is a diagram illustrating only an optical path from a plane D). Here, the second
Only the differences from the embodiment will be described, and other
Explanation is omitted. The hologram combiner optical system of the present embodiment
31 is also a hologram substrate 35 on which the HOE 37 is formed,
The optical system comprises correction optical systems 38 and 39. Correction optical system 38,
Reference numeral 39 also denotes the correction optical systems 28 and 29 in the second embodiment.
As in the case of
Fold optics, which allows the hologram combiner
The function of reducing the chromatic aberration of the optical system 31 is performed. The correction optical systems 38 and 3 according to the present embodiment are also provided.
9, the surface 39a closest to the display surface D is the second surface 39a.
Like the surface 29a of the correction optical system 29 in the embodiment,
Has a negative optical power, which
Telecentric on the incident side of the ram combiner optical system 31
And the correction optical systems 38, 39
Correction of body aberration is facilitated. In this embodiment, the display surface D is a holographic display.
In that it is located on the user side of the
Different from the second embodiment. The display surface D is arranged on the side of the user.
Accordingly, the hologram substrate 35 has the first embodiment.
The tilted anti-reflection film is similar to the reflection surface 15d of the hologram substrate 15
A projection surface 35d is formed. In addition, the correction optical systems 38 and 3
9, the surface 38b closest to the hologram substrate 35 is
The same as the incident surface 35c of the program substrate 35,
In addition, the entrance surface 35c is fixed with an air gap.
Is defined. As described above, also in the present embodiment, the second embodiment
In the same manner as described above, the correction optical systems 38 and 39 have the optical power
To reduce the burden on HOE37
Therefore, the chromatic aberration of the entire hologram combiner optical system 31 is
Can be kept small. [Specific Example of Third Embodiment] Next, a specific example of this embodiment
The lens data of the hologram combiner optical system
Tables 8 and 9 show the results. Specification of this hologram combiner optical system
Is as follows. That is, the entrance pupil diameter is 3 mm
The angle of view is ± 6.66 in the X direction and ± 5 ° in the Y direction.
is there. The apparent distance to the object is -600.000
000 mm, and the wavelength used is 524.44 nm, 51
4.44 nm and 504.44 nm. Note that the order of the surface numbers is as follows from the pupil P to the display surface D
To the direction to. Also, in the notation of HOE data,
HV1 is an object point light source, HV2 is a reference point light source, HTH is H
OE thickness, HIN is HOE refractive index, HDI is HOE
Modulation width of refractive index, HSW is HOE thickness expansion coefficient, HDN
Is the refractive index shift of the HOE, HX1 is the X coordinate of the object point light source
Mark, HY1 is the Y coordinate of the object point light source, HZ1 is the object point light source
HX2 is the X coordinate of the reference point light source, and HY2 is the reference
Y coordinate of point light source, HZ2 is Z coordinate of reference point light source, HWL
Is the light source wavelength (unit: nm) at the time of HOE manufacture. In Tables 4 and 5, “HOR” is
Diffraction order, “XDE” is shift amount in X direction, “YDE”
Is the shift amount in the Y direction, and "ZDE" is the shift amount in the Z direction.
is there. In each table, parentheses corresponding to each surface number
The reference numerals in the parentheses are the reference numerals assigned to each surface in the figure. [Table 8] [Table 9] Incidentally, in this specific example, the hologram combiner optical system
31 total optical power (focal length 14.4mm)
Optical power of HOE37 (focal length 20.5 m
The ratio of m) is 0.70. In this specific example, the HOE 37
The incident angle and the exit angle of the principal ray with respect to
9.30000 ° and 29.03443 °. Also,
The aberration diagram of this hologram combiner optical system is shown in FIG.
17 and 18. In each figure, "Y-
“FAN” is in the Y direction, “X-FAN” is in the X direction, and “FIE”
LD HEIGHT ”is the angle of view (the angle in the X direction,
Angle). [Fourth Embodiment] The present invention will be described with reference to FIG.
The fourth embodiment will be described. FIG. 19 shows this embodiment.
Of hologram combiner optical system and optical path (display
FIG. 7 is a diagram illustrating only an optical path from a plane D). Here, the first
Only the differences from the embodiment will be described, and other
Explanation is omitted. The hologram combiner optical system of the present embodiment
Is the same as that in the first embodiment. However
The HOE 47 of this embodiment has a concave surface on the side of the user's eye.
A diffraction pattern is formed on a curved surface (reflection surface)
It has become. That is, in the present embodiment,
Part of the optical power of the Gram combiner optical system 41 is
It is also allocated to the reflection curved surface that is the formation surface of HOE47.
You. As a result, diffraction by the HOE 47
The share of the optical power due to use is greater than in the first embodiment.
It can be kept smaller. Therefore, the hologram con
The overall chromatic aberration of the binar optical system 11 is smaller than that of the first embodiment.
Can be further reduced. In this embodiment,
And the reflection surface for the entire optical power of the HOE 47
The ratio of optical power due to
It is understood that it is preferable to be smaller than “5”.
ing. [Specific Example of Fourth Embodiment]
Hologram combiner optical system lens
Table data are shown in Tables 10 and 11. This hologram
The specifications of the combiner optical system are as follows. Sandals
The entrance pupil diameter is 3 mm, and the angle of view is ± 6.6 in the X direction.
It is ± 5 ° in the 6 ° Y direction. Also, the appearance to the object
The distance is -600.000000mm and the wavelength used is
524.44 nm, 514.44 nm, 504.44 n
m. It should be noted that the order of the surface numbers is as follows from the pupil P to the display surface D
To the direction to. Also, in the notation of HOE data,
HV1 is an object point light source, HV2 is a reference point light source, HTH is H
OE thickness, HIN is the refractive index of HOE, HDI is HOE
Modulation width of refractive index, HSW is HOE thickness expansion coefficient, HDN
Is the refractive index shift of the HOE, HX1 is the X coordinate of the object point light source
Mark, HY1 is the Y coordinate of the object point light source, HZ1 is the object point light source
HX2 is the X coordinate of the reference point light source, and HY2 is the reference
Y coordinate of point light source, HZ2 is Z coordinate of reference point light source, HWL
Is a light source wavelength (unit: nm) at the time of HOE manufacture. “HOR” is the diffraction order, “XDE”
Is the shift amount in the X direction, "YDE" is the shift amount in the Y direction,
“ZDE” is a shift amount in the Z direction. In each table,
In the figure, the reference numbers in parentheses corresponding to the surface numbers
Is the code given to. [Table 10] [Table 11] Incidentally, in this specific example, the hologram combiner optical system
41 overall optical power (focal length 16.0mm)
Optical power (focal length 21.0 m
The ratio of m) is 0.76. In this specific example, the HOE 47
The incident angle and the exit angle of the principal ray with respect to
9.30000 ° and 29.0180 °. Also,
In this specific example, the overall optical power of the HOE 47 is reduced.
The ratio of the optical power due to the reflection curved surface of the HOE 47 is
4.46. In this specific example, the HOE 47
The radius of curvature of the forming surface is -182.39241 mm.
You. The hologram combiner optical system
The aberration diagrams are as shown in FIG. 20, FIG. 21, and FIG. each
In the figure, “Y-FAN” is the Y direction, “X-FAN”
Is the X direction, and “FIELD HEIGHT” is the angle of view (X
Direction angle, Y direction angle). [Others] The first embodiment and the second embodiment described above.
In the third embodiment, each surface of the hologram substrate (15
a, 15b, 15c, 15d, 17, 25a, 25b,
27, 35a, 35b, 35c, 35d) as planes
However, all or part of the hologram
Part of the optical power to be applied to the combiner optical system.
May be applied to the curved surface. For example, in the second embodiment or the third embodiment,
Here, the HOE is formed on a curved surface as in the fourth embodiment.
You may. In the first and third embodiments, the supplementary
The surface 18a closest to the display surface D of the primary optical system 18 has a positive optical
Power is given, but this is negative optical power.
And the overall optical power of the correcting optical system 18 is set to be positive.
May be set. In each of the embodiments described above, the present invention
A hologram combiner optical system with a head-mounted image display
The case where the present invention is applied to the
The ram combiner optics is used for camera viewfinder and microscope.
It is constructed so that it can be attached to the eyepieces of mirrors and binoculars.
Or built into cameras, microscopes, binoculars, etc.
Or you can. As described above, according to the present invention,
Suppresses chromatic aberration regardless of light source monochromaticity or HOE wavelength selectivity
Hologram combiner optical system
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration and an optical path (only an optical path from a display surface D) of a hologram combiner optical system according to a first embodiment. FIG. 2 is an aberration diagram (first wavelength band, 0 ° in an angle of view X direction) of the hologram combiner optical system according to the first embodiment. FIG. 3 is an aberration diagram (first wavelength band, 3.33 ° in the angle of view X direction) of the hologram combiner optical system of the first embodiment. FIG. 4 is an aberration diagram (first wavelength band, 6.66 ° in the angle of view X direction) of the hologram combiner optical system of the first embodiment. FIG. 5 is an aberration diagram of the hologram combiner optical system according to the first embodiment (second wavelength band, 0 ° in the angle of view X direction). FIG. 6 is an aberration diagram of the hologram combiner optical system of the first embodiment (second wavelength band, 3.33 ° in the angle of view X direction). FIG. 7 is an aberration diagram of the hologram combiner optical system according to the first embodiment (second wavelength band, 6.66 ° in the angle of view X direction). FIG. 8 is an aberration diagram (third wavelength band, 0 ° in the angle of view X direction) of the hologram combiner optical system of the first embodiment. FIG. 9 is an aberration diagram of the hologram combiner optical system according to the first embodiment (third wavelength band, 3.33 ° in the angle of view X direction). FIG. 10 is an aberration diagram of the hologram combiner optical system according to the first embodiment (third wavelength band, 6.66 ° in the angle of view X direction). FIG. 11 is a diagram illustrating a configuration and an optical path (only an optical path from a display surface D) of a hologram combiner optical system according to a second embodiment. FIG. 12 is an aberration diagram (first wavelength band, 0 ° in the angle of view X direction) of the hologram combiner optical system according to the second embodiment. FIG. 13 is an aberration diagram of the hologram combiner optical system of the second embodiment (first wavelength band, 3.33 ° in the angle of view X direction). FIG. 14 is an aberration diagram (first wavelength band, 6.66 ° in the angle of view X direction) of the hologram combiner optical system of the second embodiment. FIG. 15 is a diagram illustrating a configuration and an optical path (only an optical path from a display surface D) of a hologram combiner optical system according to a third embodiment. FIG. 16 is an aberration diagram (first wavelength band, 0 ° in the angle of view X direction) of the hologram combiner optical system according to the third embodiment. FIG. 17 is an aberration diagram of the hologram combiner optical system of the third embodiment (first wavelength band, 3.33 ° in the angle of view X direction). FIG. 18 is an aberration diagram (first wavelength band, 6.66 ° in the angle of view X direction) of the hologram combiner optical system according to the third embodiment. FIG. 19 is a diagram illustrating a configuration and an optical path (only an optical path from a display surface D) of a hologram combiner optical system according to a fourth embodiment. FIG. 20 is an aberration diagram of the hologram combiner optical system of the fourth embodiment (first wavelength band, 0 ° in the angle of view X direction). FIG. 21 is an aberration diagram of the hologram combiner optical system of the fourth embodiment (first wavelength band, 3.33 ° in the angle of view X direction). FIG. 22 is an aberration diagram (first wavelength band, 6.66 ° in the angle of view X direction) of the hologram combiner optical system of the fourth embodiment. [Description of Signs] 11, 21, 31, 41, Hologram Combiner Optical System 15, 25, 35 Hologram Substrates 17, 27, 37, 47 Hologram Element (HOE) 18, 28, 29, 38, 39 Correction Optical System D Display Face P pupil

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 2H049 CA01 CA05 CA09 CA17 CA22                 2H087 KA23 RA42 RA45 RA46 TA01                       TA02 TA04 TA05

Claims (1)

  1. Claims 1. A hologram combiner optical system in which a hologram element for guiding both light from a predetermined image display element and light from the outside to a user's eyes is provided. A hologram combiner optical system, wherein a ratio of an optical power of the hologram element to an optical power is less than 1. 2. The hologram combiner optical system according to claim 1, wherein the ratio of the optical power is less than 1 and not less than 0. 3. The hologram combiner according to claim 1, wherein the hologram element is arranged such that an incident angle and an exit angle of a principal ray are substantially equal. Optical system. 4. A hologram combiner optical system in which a hologram element that guides both light from a predetermined image display element and light from the outside to a user's eye is arranged, wherein the diffraction surface of the hologram element has a positive surface. A hologram combiner optical system formed on a curved surface having optical power. 5. The hologram combiner optical system according to claim 4, wherein the ratio of the optical power of the curved surface to the optical power of the entire hologram element is smaller than 5. 6. The hologram combiner optical system according to claim 4, wherein the ratio of the optical power of the hologram element to the optical power of the entire optical system is less than 1. Combiner optics. 7. The hologram combiner optical system according to claim 6, wherein the ratio of the optical power is less than 1 and not less than 0. 8. The hologram combiner optical system according to claim 4, wherein the hologram element is arranged such that an incident angle and an exit angle of a principal ray are substantially equal. Features a hologram combiner optical system. 9. A hologram combiner optical system in which a hologram element for guiding both light from a predetermined image display element and light from the outside to a user's eye is provided, wherein the refraction optics has a positive optical power. A hologram combiner optical system comprising a system and / or a reflection optical system. 10. The hologram combiner optical system according to claim 9, wherein the refractive optical system and / or the reflective optical system also function as an optical system for guiding light from the image display element to the hologram element. When the optical axis of the light from the image display element is included in the horizontal plane, the optical axis of the light guided from the image display element and diffracted by the hologram element is also included in the horizontal plane. A hologram combiner optical system characterized by the following. 11. The hologram combiner optical system according to claim 9 or 10, wherein the refractive optical system and / or the reflective optical system includes a plurality of optical surfaces, and is located on a side closest to the image display element. The hologram combiner optical system, wherein the optical power of the disposed first optical surface is set to be negative.
JP2001340992A 2001-11-06 2001-11-06 Hologram combiner optical system Pending JP2003140081A (en)

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Cited By (10)

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Publication number Priority date Publication date Assignee Title
WO2004097498A1 (en) * 2003-04-28 2004-11-11 Nikon Corporation Image combiner and image display
WO2006106835A1 (en) * 2005-03-31 2006-10-12 Nikon Corporation Image forming optical system
JPWO2006001254A1 (en) * 2004-06-29 2008-04-17 株式会社ニコン Image combiner and image display device
US7542012B2 (en) 2002-12-24 2009-06-02 Nikon Corporation Head mounted display
US7843638B2 (en) 2006-09-28 2010-11-30 Brother Kogyo Kabushiki Kaisha Optical system for light flux transfer, and retinal scanning display using such an optical system
JP5282358B2 (en) * 2004-12-06 2013-09-04 株式会社ニコン Image display optical system and image display apparatus
WO2015125794A1 (en) * 2014-02-21 2015-08-27 旭硝子株式会社 Light-guiding element and video display device
US10437031B2 (en) 2016-11-08 2019-10-08 Lumus Ltd. Light-guide device with optical cutoff edge and corresponding production methods
US10481319B2 (en) 2017-03-22 2019-11-19 Lumus Ltd. Overlapping facets
US10520731B2 (en) 2014-11-11 2019-12-31 Lumus Ltd. Compact head-mounted display system protected by a hyperfine structure

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8400371B2 (en) 2002-12-24 2013-03-19 Nikon Corporation Head mount display
US7542012B2 (en) 2002-12-24 2009-06-02 Nikon Corporation Head mounted display
US7085027B2 (en) 2003-04-28 2006-08-01 Nikon Corporation Image combiner and image display
WO2004097498A1 (en) * 2003-04-28 2004-11-11 Nikon Corporation Image combiner and image display
JPWO2006001254A1 (en) * 2004-06-29 2008-04-17 株式会社ニコン Image combiner and image display device
JP5282358B2 (en) * 2004-12-06 2013-09-04 株式会社ニコン Image display optical system and image display apparatus
WO2006106835A1 (en) * 2005-03-31 2006-10-12 Nikon Corporation Image forming optical system
US7843638B2 (en) 2006-09-28 2010-11-30 Brother Kogyo Kabushiki Kaisha Optical system for light flux transfer, and retinal scanning display using such an optical system
WO2015125794A1 (en) * 2014-02-21 2015-08-27 旭硝子株式会社 Light-guiding element and video display device
JPWO2015125794A1 (en) * 2014-02-21 2017-03-30 旭硝子株式会社 Light guide element and video display device
US9921371B2 (en) 2014-02-21 2018-03-20 Asahi Glass Company, Limited Light guide element and image display device
US10520731B2 (en) 2014-11-11 2019-12-31 Lumus Ltd. Compact head-mounted display system protected by a hyperfine structure
US10437031B2 (en) 2016-11-08 2019-10-08 Lumus Ltd. Light-guide device with optical cutoff edge and corresponding production methods
US10481319B2 (en) 2017-03-22 2019-11-19 Lumus Ltd. Overlapping facets

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