JP2004151121A - Microlens array and image display device using the array - Google Patents

Microlens array and image display device using the array Download PDF

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Publication number
JP2004151121A
JP2004151121A JP2000396651A JP2000396651A JP2004151121A JP 2004151121 A JP2004151121 A JP 2004151121A JP 2000396651 A JP2000396651 A JP 2000396651A JP 2000396651 A JP2000396651 A JP 2000396651A JP 2004151121 A JP2004151121 A JP 2004151121A
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Japan
Prior art keywords
microlens array
minute
lens
dispersion portion
image
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
JP2000396651A
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Japanese (ja)
Inventor
Kazusane Matsumoto
和実 松本
Original Assignee
Hit Design:Kk
有限会社 ヒットデザイン
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 Hit Design:Kk, 有限会社 ヒットデザイン filed Critical Hit Design:Kk
Priority to JP2000396651A priority Critical patent/JP2004151121A/en
Priority claimed from PCT/JP2001/003318 external-priority patent/WO2001079916A1/en
Publication of JP2004151121A publication Critical patent/JP2004151121A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device which is small in size and light in weight and capable of displaying a highly precise image with a wide image angle. <P>SOLUTION: A lens unit 820 is provided with a minute lens and a minute deflection angle prism. Many of the units 820 having low dispersing portions 811 and many of the units 820 having high dispersing portions 812 are arranged in parallel and in a two dimensional manner to form a microlens array 810 that becomes an eyepiece of an image display device 801. Then, image formation is conducted by the minute lenses and refraction of a luminous flux is conducted by the minute prisms. Moreover, same corresponding portions of the virtual image of a display device 700 formed by respective units 820 are consistently overlapped with each other at the same location with a same size so that the array 810 synthesizes one virtual image corresponding to the virtual image of the device 700. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a microlens array for synthesizing a virtual image or a real image of an object, and an image display device using the same.
[0002]
[Prior art]
Sheet-shaped lenses such as Fresnel lenses and zone plates have long been used as small and lightweight lenses. As an optical system for forming an erect real image, an erecting equal-magnification imaging system using a microlens array is used.
[0003]
On the other hand, a relatively small and light head mounted display using a concave mirror or a free-form surface prism as an eyepiece has been put to practical use.
[0004]
[Problems to be solved by the invention]
Since the conventional sheet-shaped lens is a single lens, there is a drawback that the degree of freedom in design is small and the F-number is reduced, so that the aberration at the peripheral portion increases. Further, since the erecting unit-magnification imaging system is an optical system for synthesizing a real image, it cannot be used in an image display device for observing an image displayed on a display device as a distant virtual image.
[0005]
As a technique for solving this problem, there is a microlens array in which a large number of minute Galileo telescopes or minute inverted Galilean telescopes are arranged in two dimensions in parallel in Japanese Patent Application No. 2000-322636 by the present inventor.
[0006]
This is a microlens array that can synthesize an image with a wide angle of view and a small peripheral aberration by decentering a minute Galilean telescope or a minute inverted Galilean telescope according to each position.
[0007]
However, when the lens unit is limited to a minute Galilean telescope or a minute inverted Galilean telescope, there is a problem that a microlens array using a lens unit with a magnification of 1 as a telescope is excluded from the design. Was.
[0008]
On the other hand, in a conventional head mounted display using a concave mirror or a free-form surface prism, the concave mirror portion has an area four times or more as large as the display device. there were. On the other hand, it is difficult to achieve a resolution of VGA (640 × 480 pixels) or more in a transmissive LCD or an organic EL display having a diagonal length of about 15 mm.
[0009]
Therefore, in a conventional head mounted display using a concave mirror or a free-form surface prism, if the resolution is to be increased to XGA (1024 × 768 pixels) or more, measures such as adoption of a reflective LCD are required, and the structure becomes complicated. It was inevitable (Reference: Kokichi Kenno: "The Latest Trends and Prospects of HMD", Technical Report of the Institute of Image Information and Television Engineers, Vol. 24, No. 71, pp. 9-14).
[0010]
The present invention has been made in view of such problems of the conventional technology, and has a microlens array for synthesizing one image corresponding to one target object, and a wide angle of view and high definition using the same. It is an object of the present invention to provide a small and lightweight image display device that displays a simple image.
[0011]
[Means for Solving the Problems]
The gist of the present invention to achieve this object lies in the inventions in the following items.
[1] A lens unit (211) having a minute lens and a minute deflection prism, wherein both a front focus and a rear focus are located outside the lens unit (211) and serve as a telescope. A microlens array (210) in which a large number of ones are arranged in two dimensions in parallel,
Each virtual image or each virtual image corresponding to the same target object (200) formed by each of the lens units (211) is formed by forming an image with the minute lens and refracting the light beam with the minute deflection prism. The same corresponding parts of the real image are overlapped in the same position at the same position with the same size,
A microlens array, wherein one virtual image (201) or one real image corresponding to the same target object (200) is synthesized by the entire microlens array (210).
[0012]
[2] The lens unit (211) is a combination lens unit (420a, 420b) formed by joining a low dispersion portion (411a, 411b) and a high dispersion portion (412a, 412b),
When the microlens array (410a) has a positive refractive power as a whole,
For each of the combination lens units (420a), the inclination of the boundary surface between the low dispersion portion (411a) and the high dispersion portion (412a) is farther from the center of the microlens array (410a). Set so as to incline toward the dispersion portion (411a) side,
When the microlens array (420b) has a negative refractive power as a whole,
For each of the combination lens units (420b), the slope of the boundary surface between the low dispersion portion (411b) and the high dispersion portion (412b) is farther from the center of the microlens array (410b). The microlens array according to [1], wherein the chromatic aberration is reduced by being set so as to be inclined toward the dispersion portion side (412b).
[0013]
[3] A microlens array (510a, 510b) in which a large number of minute Galilean telescopes (520b) or minute inverted Galilean telescopes (520a) composed of minute convex lenses and minute concave lenses are arranged in two dimensions in parallel. By aligning or decentering the optical axis of the minute convex lens and the optical axis of the minute concave lens of each of the minute Galilean telescopes (520b) or the minute inverted Galilean telescope (520a), The same corresponding portion of each virtual image or each real image corresponding to the same target object formed by each of the minute Galilean telescopes (520b) or each of the minute inverse Galilean telescopes (520a) is at the same position. The micro lens array ( 510a, 510b) a microlens array which combines one virtual image or one real image corresponding to the same target object as a whole;
The minute Galilean telescope (520b) and the minute inverted Galilean telescope (520a) are a combined lens unit formed by joining a low dispersion portion (511a, 511b) and a high dispersion portion (512a, 512b). 520a, 520b)
When the microlens array (510a) has a positive refractive power as a whole,
For each of the combination lens units (520a), the inclination of the interface between the low dispersion portion (511a) and the high dispersion portion (512a) is farther from the center of the micro lens array (510a). Set so as to incline toward the dispersion portion (511a),
When the microlens array (520b) has a negative refractive power as a whole,
For each of the combination lens units (520b), the slope of the interface between the low dispersion portion (511b) and the high dispersion portion (512b) is farther from the center of the micro lens array (510b). A microlens array characterized in that chromatic aberration is reduced by being set so as to be inclined toward the dispersion portion (512b).
[0014]
[4] An image display device (801) comprising a display device (700) and the microlens array (810) according to claim 1, 2, 3, or 4,
By using the micro lens array (810) as an eyepiece,
An image display device, wherein a virtual image of the display device (700) is synthesized and displayed at a distance from the display device (700).
[0015]
[5] The head mounted display (901) for two eyes by arranging the pair of image display devices in correspondence with the left and right eyes of the observer, respectively, wherein [4]. Image display device.
[0016]
The present invention operates as follows.
In the microlens array according to the present invention, many lens units are two-dimensionally arranged in parallel.
[0017]
For example, if the display device (700) is arranged in front of the microlens array (810) according to the present invention and the observation position is set behind, the image display for displaying a virtual image of the display device (700) in the far side is displayed. An apparatus (801) can be obtained.
[0018]
That is, by increasing the focal length of the lens and the deflection angle of the deflection prism as the lens unit is farther from the center, the same corresponding portions of the virtual images of the display device formed by the respective lens units have the same size at the same position. If the microlens array (810) as a whole is overlapped so as to coincide with each other, a virtual image of the display device (700) can be synthesized at a distant place.
[0019]
Further, the lens unit of the microlens array (410a, 410b, 510a, 510b) according to the present invention includes a low dispersion portion (411a, 411b, 511a, 511b) and a high dispersion portion (412a, 412b, 512a, 512b). Chromatic aberration can be improved by using a combination lens unit (420a, 420b, 520a, 520b).
[0020]
This is similar to the conventional achromatic lens (610) composed of a low-dispersion convex lens (611) and a high-dispersion concave lens (612). Achromatism is realized by refracting the surface so that it approaches again.
[0021]
On the other hand, in the achromatism of the microlens array according to the present invention, since the achromatism is performed for each combination lens unit, if the achromatization of the peripheral portion is attempted as in the conventional achromatic lens, the achromatization of the central portion cannot be performed. Thus, good achromatism can be realized from the center to the periphery of the microlens array.
[0022]
Next, differences in shape and characteristics between the microlens array and the Fresnel lens according to the present invention will be described. In a Fresnel lens, since the entire lens surface is a rotating body about the optical axis of the lens, the imaging function and the refraction function cannot be arbitrarily adjusted for each minute portion. On the other hand, in the microlens array according to the present invention, since each lens unit has a minute lens and a minute deflection prism, the imaging function and the refraction function can be arbitrarily adjusted for each lens unit. Therefore, the microlens array according to the present invention can significantly reduce aberration as compared with the Fresnel lens.
[0023]
Next, the difference between the microlens array according to the present invention and the microlens array of the erecting equal-magnification imaging system will be described. In the microlens array according to the present invention, the focal point of each lens unit is located outside the lens unit, and the combined image is an inverted image in the case of a real image. On the other hand, in a microlens array of the erecting equal-magnification imaging system, the focal point of each lens unit is located inside the lens unit, and the synthesized image is only an erect real image. Therefore, the microlens array according to the present invention and the microlens array of the erecting equal-magnification imaging system are technologies having different principles and functions.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, various embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a basic configuration of the microlens array according to the first embodiment of the present invention.
The lens unit 111 of the microlens array 110 shown in FIG. 1A is a structure in which a minute deflection prism and a minute convex lens are continuously formed, and one surface of the lens unit on the path of light is inclined. , And the other surface forms a spherical surface that is not inclined (eccentric).
[0025]
Further, the lens unit 121 of the microlens array 120 shown in FIG. 1B has a structure in which a minute convex lens and a minute deflection prism are integrally formed, and one surface of the lens unit on the path of light is inclined. (Eccentric) spherical surface, and the other surface forms a non-inclined (eccentric) spherical surface.
[0026]
FIG. 2 shows a light path in the microlens array 210 according to the first embodiment of the present invention. Each lens unit 211 controls the divergence (convergence) and refraction by adjusting the focal length of the lens and the deflection angle of the prism, so that the radiated light from one point P on the object plane 200 is converted into a conjugate image plane 201. The light is converted into light emitted from the virtual image P ′. Although not shown, a configuration for combining real images is naturally possible.
[0027]
As a related art related to the first embodiment of the present invention, there is a microlens array according to Japanese Patent Application No. 2000-322636 filed by the present inventors. The lens unit constituting the microlens array 310 is an inverted Galilean telescope 311 (a Galileo telescope viewed from the opposite direction) as shown in FIG. Therefore, the first embodiment of the present invention is equivalent to a microlens array according to Japanese Patent Application No. 2000-322636 in which the magnification as a telescope of each inverted Galilean telescope unit is brought close to 1 as much as possible. .
[0028]
However, on the other hand, if the telescope having a magnification of 1 is no longer a telescope or an inverse telescope, the first embodiment of the present invention is described in Japanese Patent Application No. 2000-322636 by the present inventor. It is not a form of microlens array, but an independent technology. For example, when comparing FIG. 2 with FIG. 3, the difference between the microlens array according to Japanese Patent Application No. 2000-322636 and the first embodiment of the present invention is that the object plane 200 of each lens unit is different. , 300 side as a concave surface 312 when viewed from the object plane 200, 300 side.
[0029]
Next, a second embodiment of the present invention shown in FIG. 4 and a third embodiment shown in FIG. 5 will be described. Each of the lens units of the microlens arrays 410a, 410b, 510a, 510b according to the present invention is a combined lens unit 420a, 420b composed of low dispersion portions 411a, 411b, 511a, 511b and high dispersion portions 412a, 412b, 512a, 512b, 520a and 520b achieve achromatism. The light beam incident on the microlens array 410 is divided into the first boundary surfaces 401a, 401b, 501a, 501b, the second boundary surfaces 402a, 402b, 502a, 502b and the third boundary surface 403a of the combination lens units 420a, 420b, 520a, 520b. , 403b, 503a, 503b control divergence (convergence) and refraction.
[0030]
In each combination lens unit, depending on whether the refractive power of the entire microlens array is positive or negative, the side of the second boundary surface far from the center of the microlens array is determined to be a low dispersion portion side or a high dispersion portion side. Tilt to. In the example shown in FIG. 4A, since the entire microlens array 410a has a positive refractive power, the side of the second boundary surface 402a far from the center of the microlens array 410a is inclined toward the low dispersion portion 411a. By doing so, the luminous flux of the long wavelength and the short wavelength dispersed when passing through the first boundary surface 401a is refracted so as to approach again at the second boundary surface 402a, and further diverges (convergence) at the third boundary surface 403a. Achromatism is performed by controlling the refraction and the refraction so that the light flux of each wavelength forms an image of the same size at the same position.
[0031]
The essential difference between the second embodiment of the present invention shown in FIG. 4 and the third embodiment shown in FIG. 5 is that the combination lens units 420a and 420b of the second embodiment are used as telescopes. The magnification is 1, whereas the combination lens units 520a and 520b of the third embodiment are inverted Galileo telescopes (Galileo telescope viewed from the opposite side).
[0032]
Further, in the second and third embodiments of the present invention, the curvature and inclination of the lens surface can be set for each combination lens unit, so that a low dispersion convex lens 611 and a high dispersion concave lens 612 as shown in FIG. In comparison with the conventional achromatic lens 610 combining the above, the degree of freedom in design is large and aberrations can be easily suppressed.
[0033]
Next, an image display apparatus using a microlens array according to the first, second, or third embodiment of the present invention as an eyepiece will be described as a fourth embodiment of the present invention. As shown in FIGS. 7A and 8B, in a conventional concave mirror type or free-form surface prism type image display device, the outer dimensions of the optical system are defined by a concave mirror 710 having an area four times or more the size of the display device. On the other hand, as shown in FIG. 8, in the image display device 801 according to the present invention, the outer dimensions are defined by the display device 700 itself. Further, in the image display device according to the present invention, unlike the concave mirror type or the free-form surface prism type, the display device 700 does not protrude to the side. Therefore, the image display device 801 according to the present invention can be configured to be relatively small and light even when using a display device having an area (resolution) about four times that of the conventional concave mirror type or free-form surface prism type. .
[0034]
For example, the head mounted display 901 according to the present invention can be configured in a small spectacle shape as shown in FIG. In places where daily life is performed, such as at home or workplace, there are people and dangerous materials that need to be closely watched.Thus, things that cover both eyes like conventional binocular head mounted displays are extremely limited. It could only be used if given. On the other hand, a head-mounted display as shown in FIG. 9 can observe the outside world and the display alternately, so that it can be used in almost any place in daily life.
[0035]
The microlens array according to the present invention can be used for various optical systems other than the head mounted display described above. For example, the microlens array 1010 comprising the achromatic lens unit of the inverted Galileo telescope according to the present invention can be used for a loupe 1001 as shown in FIG. Since the distance can be reduced and the weight of the microlens array 1010 itself is small, the size and weight of the microlens array 1010 are significantly smaller than that of the conventional loupe 1002 as shown in FIG. 10B.
[0036]
In the embodiment described above, the lens and the deflection prism are configured by making the boundary surface of the lens unit a curved surface or an inclined surface. However, a diffraction grating or a refractive index distribution type having an optically equivalent operation is provided. The lens and the deflection prism may be configured using an optical element or the like.
[0037]
【The invention's effect】
In the microlens array according to the present invention, each lens unit has a lens and a deflection prism, and divergence (convergence), refraction, and achromatism of a light beam can be adjusted for each lens unit. An image with various aberrations can be synthesized. Therefore, the image display device using the microlens array according to the present invention as an eyepiece can display a high-definition image with a wide angle of view while being small and lightweight.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a microlens array according to a first embodiment of the present invention in which a large number of lens units each having a series of minute deflection prisms and minute convex lenses are arranged in parallel.
FIG. 2 is a perspective view showing a microlens array according to the first embodiment of the present invention in which a large number of lens units each formed by integrating a minute deflection prism and a minute convex lens are arranged in parallel.
FIG. 3 is an explanatory diagram of a microlens array according to Japanese Patent Application No. 2000-322636.
FIG. 4 is an explanatory diagram showing a mechanism of achromatism of a microlens array according to a second embodiment of the present invention.
FIG. 5 is an explanatory diagram illustrating a mechanism of achromatism of a microlens array according to a third embodiment of the present invention.
FIG. 6 is an explanatory view showing a mechanism of achromatism of a conventional achromatic lens.
FIG. 7 is an explanatory view showing an example of a conventional concave mirror type image display device and a free-form surface prism type image display device.
FIG. 8 is an explanatory diagram showing a light path of the image display device according to the present invention.
FIG. 9 is a perspective view showing an example of a usage form of the head mounted display according to the present invention.
FIG. 10 is an explanatory diagram comparing a loupe using a microlens array according to the present invention with a conventional loupe.
[Explanation of symbols]
110, 120, 210, 310, 410a, 410b, 510a, 510b, 810, 1010 Micro lens array 111, 121, 211, 311 Micro lens unit 420a, 420b, 520a, 520b, 820 Combined lens unit 200 Object plane 201 Image Plane 300, 700 Display device 312 Concave lens surface 411a, 411b, 511a, 511b, 811 Low dispersion portion 412a, 412b, 512a, 512b, 812 High dispersion portion 401a, 401b, 501a, 501b First boundary surface 402a, 402b, 502a, 502b Second boundary surface 403a, 403b, 503a, 503b Third boundary surface 610 Achromatic lens 611 Low dispersion convex lens 612 High dispersion concave lens 710 Concave mirror 801 Image display device 901 head mounted display 1000 observation plane 1001 and 1002 loupe

Claims (5)

  1. A lens unit having a minute lens and a minute deflection prism, each having a front focal point and a rear focal point located outside the lens unit and having a magnification of 1 as a telescope, is two-dimensionally arranged. A microlens array arranged in parallel to
    An image is formed by the minute lens and a light beam is refracted by the minute deflection prism so that each virtual image or the same corresponding portion of each real image corresponding to the same target object formed by each of the lens units is formed. Are the same size at the same position and overlap each other,
    A microlens array, wherein one virtual image or one real image corresponding to the same target object is synthesized over the entire microlens array.
  2. The lens unit is a combined lens unit formed by joining a low dispersion portion and a high dispersion portion,
    When the microlens array has a positive refractive power as a whole,
    For each of the combination lens units, on the side farther from the center of the microlens array, the inclination of the interface between the low dispersion portion and the high dispersion portion is set to be inclined toward the low dispersion portion side,
    When the microlens array has a negative refractive power as a whole,
    For each of the combination lens units, on the side far from the center of the microlens array, the inclination of the interface between the low dispersion portion and the high dispersion portion is set so as to be inclined toward the high dispersion portion. The microlens array according to claim 1, wherein chromatic aberration is reduced.
  3. A microlens array in which a number of minute Galileo telescopes or minute inverted Galileo telescopes each composed of a minute convex lens and a minute concave lens are arranged in two dimensions in parallel, and each of the minute Galilean telescope or the minute inverted By making the optical axis of each of the minute convex lens of the Galileo telescope coincide with or decentering the optical axis of the minute concave lens, each of the minute Galilean telescope or each of the minute inverted Galilean telescope is formed. The same corresponding portion of each virtual image or each real image corresponding to the same target object is matched and overlapped at the same position with the same size, and the entire microlens array corresponds to the same target object. Microlenses characterized by combining one virtual image or one real image In the example,
    The minute Galilean telescope and the minute inverted Galilean telescope are combined lens units formed by joining a low dispersion portion and a high dispersion portion,
    When the microlens array has a positive refractive power as a whole,
    For each of the combination lens units, on the side farther from the center of the microlens array, the inclination of the interface between the low dispersion portion and the high dispersion portion is set to be inclined toward the low dispersion portion side,
    When the microlens array has a negative refractive power as a whole,
    For each of the combination lens units, on the side far from the center of the microlens array, the inclination of the interface between the low dispersion portion and the high dispersion portion is set so as to be inclined toward the high dispersion portion. And a microlens array for reducing chromatic aberration.
  4. An image display device comprising a display device and the microlens array according to claim 1, 2, or 3,
    By using the micro lens array as an eyepiece,
    An image display apparatus, wherein a virtual image of the display device is synthesized and displayed at a distance from the display device.
  5. 5. The image display apparatus according to claim 4, wherein the pair of image display apparatuses are arranged so as to correspond to the left and right eyes of the observer, respectively, thereby forming a head mounted display for both eyes.
JP2000396651A 2000-12-27 2000-12-27 Microlens array and image display device using the array Pending JP2004151121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000396651A JP2004151121A (en) 2000-12-27 2000-12-27 Microlens array and image display device using the array

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000396651A JP2004151121A (en) 2000-12-27 2000-12-27 Microlens array and image display device using the array
PCT/JP2001/003318 WO2001079916A1 (en) 2000-04-19 2001-04-18 Micro-lens array and image display unit and telescope using it
AU4878101A AU4878101A (en) 2000-04-19 2001-04-18 Micro-lens array and image display unit and telescope using it

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