JPH0690023A - Light emitting element array and its application device - Google Patents

Abstract

PURPOSE:To obtain an image of a light source at high resolution by assigning a cylindrical lens directly before an n-numbers of light emitting elements, so that a conjugate relationship is established between the light emitting surface of emitting element and the main plane of the imaging lens, with the cylindrical axis extending parallel to the straight array direction of emitting element. CONSTITUTION:A light emitting area Zp of the emitting element of a light emitting diode array PEA is imaged at the main plane of an imaging lens Lo as an image size 'my', generated by magnifying the longitudinal length y in m times, with cylindrical lens CL's magnification m=L2/L1. Assuming that the imaging lens Lo images the image of power factor 1 at an imaging plane I, the image of light emitting area Zp of emitting element is generated at the imaging plane I. The width of cylindrical lens W is defined within the range in which the light from Zp can be fully utilized, and the light flux emitted from Zp is made incident on the imaging lens Lo by the cylindrical lens CL, so that the imaging lens CL generates the image of emitting area brightly and with high-resolution at the imaging plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device and a device using the same.

[0002]

2. Description of the Related Art A light emitting element array having a plurality of light emitting elements linearly arranged at a predetermined distance from each other is used, for example, in a display element in a projection type high resolution display device or a print head in a printer. Can be used. Then, in the applicant company, as a high resolution display device cited as an application example of the above-mentioned light emitting element array,
Pixels corresponding to the respective light emitting elements over a predetermined period in the N light emitting elements in the light emitting element array in which the N light emitting elements (for example, light emitting diodes) corresponding to the N pixels are linearly arranged. Of information,
The N light emitting elements in the above light emitting element array are caused to emit light simultaneously for the above period, and the light is emitted from each of the light emitting elements in a direction orthogonal to the alignment direction of the light emitted from each of the light emitting elements of the light emitting element array. The polarized light is simultaneously deflected, and the deflected light is coupled to the photoconductive layer in the spatial light modulator including at least a photoconductive layer member and a light modulation material layer member between two electrodes. A display device is proposed in which an image is formed and read light is applied to the spatial light modulator to display the image information read from the spatial light modulator on a screen.

By the way, in the case of obtaining a display device capable of displaying a high-resolution and high-luminance image in a low afterimage, as a display device constructed by using the spatial light modulator as described above, , A large amount of writing light is required. Therefore, in order to efficiently use the light emitted from the light source, the light emitted from the light source is condensed by a reflecting mirror and then collimated into parallel light by a lens, thereby improving the light use efficiency and increasing the writing light. However, since the light source that emits the writing light intensity-modulated by the pixel information has a finite size and is not a point light source, the diffused light emitted from the light source can be obtained. Even if the light is made into parallel light by a lens and is used efficiently, the light emitted from a light source that is not a point light source is not a perfect parallel light flux, and the light utilization rate is reduced.
If the light source that emits the writing light intensity-modulated by the pixel information is, for example, a long linear light source in which light emitting diodes are linearly arranged to generate linear writing light, a linear light source is used. Since a positive lens (convex lens) with a large aperture is required to condense the linear light emitted from the light source into parallel light, the cost will increase if such an optical system is configured. .

In order to solve the above problems, the applicant company has proposed a display device having a structure as shown in FIG. 9 (Japanese Patent Application No. 3-285716). In FIG. 9, LLS is a linear light source, CLp is a cylindrical positive lens (cylindrical convex lens) having a cylindrical axis parallel to the extending direction of the linear writing light, and CLm is the linear writing light described above. Cylinder negative lens (cylindrical concave lens) having a cylinder axis parallel to the existing direction, M
g is an oscillating mirror (galvano mirror), Lo is an imaging lens, S
The LM is a spatial light modulator including at least a photoconductive layer member and a light modulator layer member between two electrodes. PBS is a polarization beam splitter, LS is a light source for reading light, Lp is a projection lens, S is a screen, and linear writing light emitted from the linear light source LLS is extended in the direction in which the linear writing light extends. The light is condensed by a cylindrical positive lens CLp having a cylindrical axis parallel to, and is made incident on a cylindrical negative lens CLm having a cylindrical axis parallel to the extending direction of the linear writing light, and the cylindrical negative lens CLm. The light diverged by the oscillating mirror Mg is incident on the oscillating mirror Mg, and the oscillating mirror M extends in the oscillating axis direction of the oscillating mirror Mg.
The linear writing light incident on g is deflected in the direction of the arrow Y in FIG. 9 by the oscillating motion of the oscillating mirror Mg, and is focused by the imaging lens Lo to be photoconductive of the spatial light modulator SLM. An image is formed on the layer member PCL.

In the display device shown in FIG. 9, a linear light source LL is used.
The writing light of the non-parallel light emitted from S is a linear light source L
The light is incident on the cylindrical positive lens CLp in a state of being diffused from LS, and the light incident on the cylindrical positive lens CLp is condensed only in the direction orthogonal to the cylindrical axis in the main plane of the cylindrical positive lens CLp. It is emitted as light. As described above, the cylindrical positive lens C arranged so that the direction of the cylindrical axis is parallel to the extending direction of the linear writing light.
If the writing light in the non-parallel state emitted from the linear light source LLS is made to enter the imaging lens Lo by Lp, the linear writing light is more linear than in the case where the cylindrical positive lens CLp is not used. The utilization efficiency of the writing light in the non-parallel state emitted from the light source LLS is improved, but the condensing action of the cylindrical positive lens CLp described above causes the light incident thereon to be orthogonal to the cylindrical axis in the main plane of the cylindrical positive lens CLp. However, even if this light is imaged on the photoconductive layer member PCL of the spatial light modulator SLM by the imaging lens Lp, the resolution in the horizontal and vertical directions of the image is wide. It is different, and it is impossible to record and reproduce a high resolution image.

Therefore, in the display device shown in FIG.
The light emitted from the cylindrical positive lens CLp is made to enter the imaging lens Lo via the cylindrical negative lens CLm arranged such that the direction of the cylindrical axis is parallel to the extending direction of the linear writing light. As a result, the cylindrical negative lens CLm described above diffuses the light emitted from the cylindrical positive lens CLp, which has entered the cylindrical negative lens CLm, only in the direction orthogonal to the cylindrical axis in the main plane of the cylindrical negative lens CLm, and the light is formed into the imaging lens. When the image is formed on the photoconductive layer member PCL of the spatial light modulator SLM by Lo, the difference in resolution between the horizontal direction and the vertical direction of the image is eliminated, and the recording and reproduction of the high-resolution image is emitted from the light source. The light is used efficiently.

In FIG. 9, SLM is a spatial light modulator, P
BS is a polarization beam splitter, LS is a light source for reading light,
Lp is a projection lens and S is a screen. The writing light imaged by the imaging lens Lo on the photoconductive layer member PCL of the spatial light modulation element SLM is projected onto the spatial light modulation element SLM and is displayed on the spatial light modulation element SLM. Although image information is written, as the spatial light modulator SLM described above, as illustrated in FIG.
For example, the transparent substrate BP1, the transparent electrode Et1, the photoconductive layer member P
What is configured by laminating CL, the dielectric mirror DML, the light modulation material layer member PML, the transparent electrode Et2, and the transparent substrate BP2 may be used (see FIG. 8 described later with reference to FIG. 8). The same applies to the spatial light modulator SLM used in the display device shown in FIG.

Transparent electrode E in the spatial light modulator SLM
t1 and Et2 are composed of a thin film of a transparent conductive material, and the photoconductive layer member PCL is a material exhibiting photoconductivity in the wavelength range of light used, for example, hydrogenated amorphous silicon (a-Si-H). May be used. Further, as the dielectric mirror DML, a well-known one configured as a multilayer film so as to be able to reflect light of a predetermined wavelength band can be used,
Furthermore, as the light modulation material layer member PML, for example, a light modulation material layer member configured by using a nematic liquid crystal having a negative dielectric anisotropy having an electric field control type birefringence effect as vertical alignment is used. There is. E is a transparent electrode Et1, E
It is a power supply for applying a predetermined voltage during t2.

From the transparent substrate BP1 side of the spatial light modulator SLM in which a predetermined voltage is supplied from the power source E between the transparent electrodes Et1 and Et2, N writing light fluxes whose intensity is modulated by image information are incident. , When it is focused on the photoconductive layer member PCL in the spatial light modulator SLM,
The photoconductive layer member P at the portion where the writing light flux is condensed.
The electric resistance value of CL changes with high sensitivity according to the amount of light emitted, and the intensity of the image information targeted for display is increased at the boundary between the photoconductive layer member PCL and the dielectric mirror DML. A charge image corresponding to the irradiation light amount by the modulated writing light is formed favorably, and as a result, the photoconductive layer member PCL and the dielectric mirror DML are formed in the light modulation material layer member PML of the spatial light modulation element SLM. An electric field due to the charge image formed at the boundary between and is applied. Then, when the visible light read light emitted from the light source LS of the read light is incident on the polarization beam splitter PBS, the S-polarized light component of the read light RL is generated by the polarization beam splitter PBS on the read side of the spatial light modulator SLM. The light is reflected in one direction and enters from the transparent substrate BP2 on the read side of the spatial light modulator SLM. As described above, the spatial light modulator SL
The read light RL incident from the transparent substrate BP2 side of M reaches the dielectric mirror DML by the route of the transparent substrate BP2 → the transparent electrode Et2 → the light modulation material layer member PML → the dielectric mirror DML, and the read light reflected there is reflected. Light is emitted from the spatial light modulator SLM along a path of the dielectric mirror DML → light modulator material layer member PML → transparent electrode Et2 → transparent substrate BP2 →.

As described above, the luminous flux of the read-out light emitted from the spatial light modulator SLM is applied with an electric field based on a charge image in a state in which charges having a charge amount corresponding to sequential pixel information are arranged. Since the light beam is a light beam that travels back and forth through the light modulating material layer member PML, the light beam has a state of polarization plane that changes corresponding to the sequential pixel information that is linearly arranged. Then, the spatial light modulator SL
The N pieces of readout light simultaneously emitted from M are incident on the polarization beam splitter PBS, and the P-polarized light component of the incident light is transmitted from the polarization beam splitter PBS to the projection lens L.
Simultaneously applied to p, the projection lens Lp projects it simultaneously on the screen S as a plurality of light spots linearly arranged.

[0011]

By the way, when a high-resolution and high-luminance image is displayed in a low afterimage state as in the already proposed display device described with reference to FIG. 9, the light is emitted from the light source. The linear writing light emitted from the linear light source is arranged so that the direction in which the linear writing light extends and the cylindrical axis are parallel to each other so that the light can be used efficiently. After being focused by the installed cylindrical positive lens CLp, the cylindrical negative lens C is installed such that the direction in which the linear writing light extends and the cylindrical axis are parallel to each other.
When the writing light emitted from the linear light source is effectively used by making the light incident on the imaging lens in a state of being diverged by Lm, the cylindrical positive lens CLp and Although two optical members with the cylindrical negative lens CLm are used in combination, there is a problem that strict precision is required for the installation positions of the above-mentioned two optical members, and a solution to that is a solution. I was asked.

[0012]

SUMMARY OF THE INVENTION According to the present invention, at a position immediately before N light emitting elements linearly arranged corresponding to N pixels, the light emitting elements are arranged in parallel with the linear arrangement direction. As a cylindrical lens arranged with the cylindrical axis extending,
The width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the above-described light emitting element, and the light emitting element array formed by using such a pixel array corresponds to N pixels. As a cylindrical lens arranged at a position immediately in front of the N light emitting elements linearly arranged in such a manner that the cylindrical axis extends in parallel with the linear arrangement direction of the light emitting elements. The width of the cylindrical lens in the direction orthogonal to the cylindrical axis is configured to be the same as or smaller than the pixel pitch of the light emitting element, and the shape of the light emitting element on the light emitting surface of the light emitting element. In a state in which the length in the direction orthogonal to the arrangement direction of the light emitting elements is shorter than the length in the arrangement direction of the light emitting elements, and a linear shape corresponding to the N pixels. N sources arranged in As a cylindrical lens arranged at a position immediately in front of the element in a state where the cylindrical axis extends parallel to the linear arrangement direction of the light emitting elements, the width of the cylindrical lens in the direction orthogonal to the cylindrical axis. However, the light emitting element is configured to have a pixel pitch equal to or less than that of the pixel pitch, and the light exiting side of the cylindrical lens is shielded from light leaking except for the pixel pitch width of the cylindrical lens. The light emitting element array provided with the means and the N light emitting elements linearly arranged corresponding to the N pixels have a cylindrical axis in parallel with the linear arrangement direction of the light emitting elements. As a cylindrical lens arranged in the extended state,
The width of the cylindrical lens in the direction orthogonal to the cylindrical axis is configured to be the same as or smaller than the pixel pitch of the light emitting element, and each of the cylindrical lens on the exit surface side is formed. A light emitting element array in which a light shielding unit is provided between pixels and a position immediately before N light emitting elements linearly arranged corresponding to N pixels are parallel to the linear arrangement direction of the light emitting elements. As a cylindrical lens arranged in a state where the cylindrical axis extends, the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element. And a light emitting element array in which an opening is provided for each pixel on the exit surface side of the cylindrical lens, and N
In a state in which a cylindrical axis extends parallel to the linear array direction of the light-emitting elements, at a position immediately before the N light-emitting elements linearly arrayed corresponding to the pixels, and A light emitting element array in which the cylindrical lens is arranged such that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element, and the cylindrical lens in the light emitting element array. And a cylindrical lens for arranging the light emitting surface of the light emitting element and the main plane of the imaging lens to have a conjugate relationship with each other. At the same time, there is provided a device for utilizing a light-emitting element, in which the imaging lens is arranged such that the principal plane of the cylindrical lens and the imaging surface are in a conjugate relationship.

[0013]

A state in which a cylindrical axis extends in parallel with the linear array direction of the light emitting elements at a position immediately before the N light emitting elements linearly arrayed corresponding to the N pixels. In the cylindrical lens arranged such that the light emitting surface of the light emitting element and the main plane of the imaging lens are in a conjugate relationship, the light emitted from each light emitting element is effectively incident on the imaging lens. The light emitted from the light emitting element is efficiently formed as a high-resolution light source image on the image forming surface of the image forming lens that is in a conjugate relationship with the main plane of the cylindrical lens.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The light emitting element array of the present invention and the specific use of the same will be described in detail below with reference to the accompanying drawings. FIG. 1 is a partial perspective view showing a schematic configuration of a light emitting element array of the present invention, and FIG. 2 is an optical system for explaining the configuration principle and operation principle of the light emitting element array of the present invention and a device using the same. FIG. 3 is a plan view for explaining a light emitting region of a light emitting element in the light emitting element array of the present invention, and FIG. 4 is a plan view of a part of an optical system of the light emitting element array of the present invention. 5 is a front view of a part of the light emitting element array of the present invention, FIG. 6 is a perspective view of a part of the light emitting element array of the present invention, FIG. 5 is a front view of a part of the light emitting element array of the present invention, and FIG. FIG. 8 is a front view of a part of the light emitting element array of the present invention, and FIG. 8 is a perspective view showing a configuration example of a device using the light emitting element array of the present invention. In FIG. 1, which shows a perspective view of a part of the schematic configuration of the light-emitting element array of the present invention, PEA is the entire reference numeral of the light-emitting element array, BP is a substrate, Zp, Zp, ... Are predetermined pitches P (see FIG. 3). ) Linearly arranged (N
The light emitting areas Ep, Ep ... Of the individual light emitting elements are electrodes, and the light emitting areas Zp, Zp ... of the respective light emitting elements in this light emitting element array PEA are the same as those shown in FIG. The length in the aligned direction (horizontal length) is x, and the length in the direction orthogonal to the aligned light emitting elements (vertical length) is as described above. The length y has a relation of x> y with respect to the horizontal length x.

In FIG. 1, CL is a state in which a cylindrical axis extends at a predetermined position immediately in front of a plurality of linearly arranged light emitting elements in parallel with the linear arraying direction of the light emitting elements. As shown in FIGS. 2 and 4, the cylindrical lens CD is arranged at a position L1 (for example, L1 is several tens of microns) from the light emitting surface of the light emitting element array PEA. Has been done. The cylindrical lens C
L is such that the width W of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch P of the light emitting elements of the light emitting element. The width W of the cylindrical lens is set to be small within a range in which light from the light emitting area Zp of the light emitting element having a length y in the vertical direction in the light emitting element array PEA can be used without waste. In FIG. 2, Lo is an imaging lens, and this imaging lens Lo is arranged such that the position of its principal plane is a distance L2 from the position of the principal plane of the cylindrical lens CL described above, and I Indicates an image forming plane located at a position of distance L3 from the position of the main plane of the image forming lens Lo described above. Then, the light emitting surface of the light emitting element and the imaging lens L in the light emitting element array PEA described above.
In order to have a conjugate relationship with the principal plane of o, L1,
L2 is defined and the cylindrical lens CL is arranged, and L2 and L3 in FIG. 2 are defined so that the principal plane of the cylindrical lens CL and the image plane I are in a conjugate relationship. The lens Lo is arranged.

Therefore, in the light emitting area Zp of each light emitting element in the light emitting diode array PEA, the length y in the vertical direction is multiplied by the magnification m = L2 / L1 of the cylindrical lens CL to obtain a size my (image formation). An image of the same size as the diameter of the lens Lo) is formed at the position of the main plane of the imaging lens Lo, and an image of the same size is now formed on the imaging surface I by the imaging lens Lo. In this case, the image of the light emitting area Zp of the light emitting element is formed on the image forming plane I with the width W of the cylindrical lens in the direction orthogonal to the cylindrical axis being the length in the vertical direction of the pixel. Will be. As described above, the width W of the cylindrical lens is the light emitting area Z of the light emitting element such that the length in the vertical direction of the light emitting element array PEA is y.
Since the light from p is determined to be small in a range that can be used without waste, in the light emitting element array PEA of the present invention, the light emission bundles emitted from the light emitting regions Zp of the respective light emitting elements are efficiently combined by the cylindrical lens CL. The light is made incident on the image lens Lo, and the image of the light emitting region with high brightness and high resolution can be formed on the image forming surface by the image forming lens Lo.

Light emitting diode used as light emitting element
The light emission output from the (LED) increases substantially in proportion to the current density, but in the light emitting element array PEA of the present invention, as described above, the image of the light emitting region Zp is formed on the image forming surface with high efficiency. Since the image can be formed, the driving power can be greatly reduced compared to the conventional light emitting element array with respect to the required light amount. The light emitting diode (LED) has a lower light emitting efficiency and a lower light emitting output in inverse proportion to the temperature. However, in the light emitting element array of the present invention, the area of the light emitting region Zp is as illustrated in FIG. Is small, the driving current is small and the temperature rise due to heat generation is small.
The decrease in luminous efficiency is small, and therefore, the luminous output can be further increased.

Next, in FIG. 5, a cylindrical axis is provided at a position immediately in front of the N light emitting elements linearly arranged corresponding to the N pixels, in parallel with the linear arrangement direction of the light emitting elements. As the cylindrical lens CL arranged in the extended state, the width W of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch P of the light emitting element. A light-emitting diode array PEA configured by using a light-emitting diode array PEA as shown in FIG. FIG. 6 is a plan view of a part of the lens CL, and the parts 1 and 2 in FIG. 5 are cylindrical lenses CL.
The light-shielding portion 3 is formed by applying, for example, black paint to a predetermined portion on the periphery of the emission surface side, and 3 is a light-transmitting portion. The light shielding parts 1 and 2 described above. As shown in FIG. 5, the light-shielding portion 1, which shields light that leaks outside the pixel pitch width of the cylindrical lens, on the exit surface side of the cylindrical lens CL.
When 2 is provided, the MTF on the image plane can be improved.

In FIG. 6, a cylindrical axis extends parallel to the linear arrangement direction of the light emitting elements at a position immediately before the N light emitting elements linearly arranged corresponding to the N pixels. As the cylindrical lens CL arranged in such a state that the width W of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch P of the light emitting element is used. 7 is a perspective view of a cylindrical lens in which light-shielding portions 4, 4 ... Are provided between pixels on the emission surface side of the cylindrical lens CL of the light emitting diode array PEA as shown in FIG. 5 ... Is a light-transmitting portion, and P, P ... are pixel pitches. As described above, the cylindrical lens CL is arranged so that the light emitting surface of the light emitting element in the light emitting element array PEA and the main plane of the imaging lens Lo are in a conjugate relationship, and the main plane of the cylindrical lens CL and the image are formed. In the device of the present invention in which the imaging lens Lo is arranged such that the plane I has a conjugate relationship, the light emitting surface in the light emitting element array PEA and the main plane of the cylindrical lens CL are separated by the distance L1. Therefore, although a slight deterioration of resolution occurs in the cylindrical axis direction in which the lens action is not performed for the cylindrical lens CL, as shown in FIG. 6, the light shielding parts 4, 4, ... Are provided between the pixels. As a result, the surface of the cylindrical lens CL is equivalent to emitting light, so that the MTF of the resolution is increased.
No change will occur. Further, FIG. 7 is a plan view of a part of the cylindrical lens CL to which both the light blocking means described with reference to FIG. 5 and the light blocking means described with reference to FIG. 6 are applied. , 4 are light-shielding portions, and 7, 7 ... Are light-transmitting portions (apertures). By using the cylindrical lens CL having the structure as shown in FIG. 7, it is possible to increase the light amount without deteriorating the MTF.

Next, FIG. 8 shows a display device as an example of a device utilizing the light emitting diode array of the present invention. The display device shown in FIG. 8 is a light emitting diode array PEA.
In a state immediately before the N light emitting elements linearly arranged corresponding to the N pixels, the cylindrical axis extends in parallel with the linear arrangement direction of the light emitting elements, Also, the cylindrical lens in the light emitting element array PEA in which the cylindrical lens CL is arranged such that the width W of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element. The light emitted from CL is made incident on an image forming lens Lo which forms an image on the image forming surface of the spatial light modulator SLM via an oscillating mirror Mg which is oscillated by an optical deflection driving device MGA, The cylindrical lens CL is arranged such that the light emitting surface of the light emitting element of the light emitting diode array PEA and the main plane of the imaging lens Lo have a conjugate relationship, and the main plane of the cylindrical lens Lo and the imaging surface are formed. Conjugate function The so that the imaging lens Lo
Has been placed. In FIG. 8, the SLM is a spatial light modulation element including at least a photoconductive layer member and a light modulation material layer member between two electrodes.
S is a polarization beam splitter, LS is a light source for reading light, L
p is a projection lens, S is a screen, and the spatial light modulator SLM described above includes, for example, a transparent substrate BP1, a transparent electrode Et1, a photoconductive layer member PCL, as illustrated in FIG. 9 described above. A dielectric mirror DML, a light modulation material layer member PML, a transparent electrode Et2, and a transparent substrate BP2 may be laminated and used. E is a power source for applying a predetermined voltage between the transparent electrodes Et1 and Et2.

The light emitting element array PEA used in the display device shown in FIG. 8 is, for example, a light emitting area of a plurality (N) of light emitting elements linearly arranged at a predetermined pitch P. Zp, Zp ... are lengths in the direction in which the light emitting elements are aligned (horizontal lengths) and lengths in the direction orthogonal to the direction in which the light emitting elements are aligned (lengths in the vertical direction). y and
The length y has a relation of x> y, and the distance L1 (for example, L1 is several tens of microns) from the light emitting surface of the plurality of linearly arranged light emitting elements.
At a position where the cylindrical axis extends in parallel with the linear arrangement direction of the light emitting elements, the width dimension W in the direction orthogonal to the cylindrical axis is the pixel pitch of the light emitting elements of the light emitting element. A cylindrical lens CD having a size equal to or smaller than that of P is arranged, and light from the light emitting area Zp of the light emitting element whose length in the vertical direction in the light emitting element array PEA is y is formed without waste. Can be supplied to Lo.

Then, as described above, the light emitting element array PE
The light emitting surface of the light emitting element in A and the principal plane of the imaging lens Lo are in a conjugate relationship, and the principal plane of the cylindrical lens CL and the imaging surface I are in a conjugate relationship. Since CL and the imaging lens Lo are arranged, the light emitting region Zp of each light emitting element in the light emitting diode array PEA has a length y in the vertical direction that is the same as the aperture size of the cylindrical lens CL. An image is formed at the position of the principal plane of the imaging lens Lo, and the image forming surface I
In the state where the width W of the cylindrical lens in the direction orthogonal to the cylindrical axis is the length in the vertical direction of the pixel,
An image of p is formed. As described above, the width W of the cylindrical lens is set to be small within a range in which the light from the light emitting area Zp of the light emitting element whose length in the vertical direction in the light emitting element array PEA is y can be used without waste. Therefore, the bundle of emitted light emitted from the light emitting area Zp of each light emitting element of the light emitting element array PEA is efficiently incident on the imaging lens Lo by the cylindrical lens CL, and is in a high brightness and high resolution state by the imaging lens Lo. The image of the light emitting region of the spatial light modulator S
An image is formed on the photoconductive layer member of the LM.

The structure and operation of the spatial light modulation element SLM used in the display device shown in FIG. 8 are the same as those of the spatial light modulation element used in the display device described above with reference to FIG. Since the configuration and operation of the SLM are the same, the spatial light modulation element shown in FIG. 8 in which a predetermined voltage is supplied from the power source E between the two transparent electrodes (see Et1 and Et2 in FIG. 9). From the side of the transparent substrate (see BP1 in FIG. 9) of the SLM, N writing light fluxes, the intensity of which is modulated by image information, are incident, and these enter the photoconductive layer member (in FIG. 9) of the spatial light modulator SLM. When it is focused on (see PCL),
The electric resistance value of the photoconductive layer member at the portion where the writing light flux is condensed changes with high sensitivity in accordance with the amount of light irradiated respectively, and the photoconductive layer member and the dielectric mirror (D in FIG. 9).
(See ML), a charge image corresponding to the irradiation light amount by the writing light intensity-modulated by the image information to be displayed is appropriately formed at the boundary, and thereby the spatial light modulation is performed. An electric field due to a charge image formed at the boundary between the photoconductive layer member and the dielectric mirror is applied to the light modulation material layer member (see PML in FIG. 9) of the element SLM.

Then, when the read light in the visible range emitted from the light source LS of the read light is incident on the polarization beam splitter PBS, the S-polarized light component of the above-mentioned read light RL is transmitted by the polarization beam splitter PBS to the spatial light modulator SLM.
Of the spatial light modulator SLM and is incident from the transparent substrate (see BP2 in FIG. 9) on the read side of the spatial light modulator SLM. As described above with reference to FIG. 9, the read light RL incident from the transparent substrate side of the spatial light modulation element SLM is the same as the transparent substrate BP2 → transparent electrode Et2 → light modulation material layer member PML → dielectric. The reflected light of the read light that reaches the dielectric mirror DML by the path of the body mirror DML and is reflected there is spatially modulated by the path of the dielectric mirror DML → light modulation material layer member PML → transparent electrode Et2 → transparent substrate BP2 →. Element S
Emit from LM.

As described above, the read light beam emitted from the spatial light modulator SLM is applied with an electric field based on a charge image in a state in which charges of a charge amount corresponding to sequential pixel information are arranged. Since the light beam is a light beam that travels back and forth through the light modulating material layer member PML, the light beam has a state of polarization plane that changes corresponding to the sequential pixel information that is linearly arranged. Then, the spatial light modulator SL
The N pieces of readout light simultaneously emitted from M are incident on the polarization beam splitter PBS, and the P-polarized light component of the incident light is transmitted from the polarization beam splitter PBS to the projection lens L.
Simultaneously applied to p, the projection lens Lp projects it simultaneously on the screen S as a plurality of light spots linearly arranged.

[0026]

As is apparent from the above detailed description, in the light emitting element array of the present invention and the device using the same, the N light emitting elements arranged linearly corresponding to N pixels are arranged. At the position immediately before, with the cylindrical axis extending parallel to the linear array direction of the light emitting element, the light emitting surface of the light emitting element and the main plane of the imaging lens are made to have a conjugate relationship. The arranged cylindrical lens effectively makes the light emitted from each light emitting element incident on the image forming lens, and emits light on the image forming surface of the image forming lens which has a conjugate relationship with the main plane of the cylindrical lens. The light emitted from the element efficiently and
Since it is formed as a high-resolution light source image, the light emitted from the light source is efficiently used in the already proposed display device described above, and a high-resolution and high-luminance image is displayed in a low afterimage state. In order to display the linear writing light emitted from the linear light source, a cylindrical positive lens installed so that the direction in which the linear writing light extends and the cylindrical axis are parallel to each other. After focusing, the linear writing light is made incident on the imaging lens in a diverging state by a cylindrical negative lens installed so that the direction in which the linear writing light extends and the cylindrical axis are parallel to each other. However, the present invention does not have the problem that strict accuracy is required for the installation positions of the two optical members, that is, the cylindrical positive lens and the cylindrical negative lens. With a simple configuration that uses a cylindrical lens of The light utilization device with high luminance can be easily provided in the image of.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a schematic configuration of a light emitting element array of the present invention.

FIG. 2 is a plan view of a part of an optical system for explaining a configuration principle and an operation principle of a light emitting element array of the present invention and a device using the same.

FIG. 3 is a plan view for explaining a light emitting region of a light emitting element in a light emitting element array of the present invention.

FIG. 4 is a plan view of a part of an optical system of a light emitting device array of the present invention.

FIG. 5 is a front view of a part of the light emitting device array of the present invention.

FIG. 6 is a perspective view of a part of the light emitting device array of the present invention.

FIG. 5 is a front view of a part of the light emitting device array of the present invention.

FIG. 7 is a front view of a part of the light emitting device array of the present invention.

FIG. 8 is a perspective view showing a configuration example of a device using a light emitting element array of the present invention.

FIG. 9 is a perspective view of a conventional display device.

[Explanation of symbols]

1, 2, 4 ... Light-shielding portion, 3, 5 ... Light transmitting portion, 7 ... Light transmitting portion (aperture), LLS ... Linear light source, CLp ... Cylindrical positive lens (cylindrical convex lens), CLm ... Cylindrical negative lens (cylindrical) Concave lens), Mg ... rocking mirror, MGA ...
Optical deflection driving device, Lo ... Imaging lens, SLM ... Spatial light modulator, PBS ... Polarization beam splitter, LS ... Read light source, Lp ... Projection lens, S ... Screen, PCL
... Photoconductive layer member, Lp ... Projection lens, BP1, BP2 ... Transparent substrate, Et1, Et2 ... Transparent electrode, PCL ... Photoconductive layer member, DML ... Dielectric mirror, PML ... Light modulation material layer member,
E ... Power source, PEA ... Light emitting element, CL ... Cylindrical lens,

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 17, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a schematic configuration of a light emitting element array of the present invention.

FIG. 2 is a plan view of a part of an optical system for explaining a configuration principle and an operation principle of a light emitting element array of the present invention and a device using the same.

FIG. 3 is a plan view for explaining a light emitting region of a light emitting element in a light emitting element array of the present invention.

FIG. 4 is a plan view of a part of an optical system of a light emitting device array of the present invention.

FIG. 5 is a front view of a part of the light emitting device array of the present invention.

FIG. 6 is a perspective view of a part of the light emitting device array of the present invention.

FIG. 7 is a front view of a part of the light emitting device array of the present invention.

FIG. 8 is a perspective view showing a configuration example of a device using a light emitting element array of the present invention.

FIG. 9 is a perspective view of a conventional display device.

[Description of Reference Signs] 1, 2, 4 ... Light-shielding portion, 3, 5 ... Light transmitting portion, 7 ... Light transmitting portion (aperture), LLS ... Linear light source, CLp ... Cylindrical positive lens (cylindrical convex lens), CLm ... Cylindrical negative lens (cylindrical concave lens), Mg ... Oscillating mirror, MGA ...
Optical deflection driving device, Lo ... Imaging lens, SLM ... Spatial light modulator, PBS ... Polarization beam splitter, LS ... Read light source, Lp ... Projection lens, S ... Screen, PCL
... Photoconductive layer member, Lp ... Projection lens, BP1, BP2 ... Transparent substrate, Et1, Et2 ... Transparent electrode, PCL ... Photoconductive layer member, DML ... Dielectric mirror, PML ... Light modulation material layer member,
E ... Power source, PEA ... Light emitting element, CL ... Cylindrical lens,

Front page continuation (72) Inventor Tetsuji Suzuki, 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Prefecture, Japan Victor Co., Ltd. (72) Inventor Reiji Futako, 3-12 Moriya-cho, Kanagawa-ku, Yokohama Inside Victor Company of Japan (72) Inventor Ryusaku Takahashi 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Inside Victor Company of Japan (72) Hiroyuki Bonde 3-12 Moriya-cho, Kanagawa-ku, Kanagawa Local Victor Company of Japan (72) Inventor Tsutomu Matsumura 3-12 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa

Claims (6)

[Claims] 1. A cylindrical axis extends parallel to the linear array direction of the light emitting elements at a position immediately before the N light emitting elements linearly arrayed corresponding to the N pixels. As the cylindrical lens arranged in such a state that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element described above, Characteristic light emitting element array. 2. A cylindrical axis extends in parallel with the linear array direction of the light emitting elements at a position immediately in front of the N light emitting elements linearly arrayed corresponding to the N pixels. As the cylindrical lens arranged in such a state that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element, and is configured, The shape of the light emitting element on the light emitting surface of the light emitting element is set such that the length in the direction orthogonal to the array direction of the light emitting element is shorter than the length in the array direction of the light emitting element. Light emitting element array. 3. A cylindrical axis extends parallel to the linear arraying direction of the light emitting elements at a position immediately in front of the N light emitting elements linearly arrayed corresponding to the N pixels. As the cylindrical lens arranged in such a state that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element, and is configured, On the output surface side of the cylindrical lens described above,
A light-emitting element array provided with means for blocking light that leaks outside the pixel pitch width of a cylindrical lens. 4. A cylindrical axis extends parallel to the linear arrangement direction of the light emitting elements at a position immediately before the N light emitting elements linearly arranged corresponding to the N pixels. As the cylindrical lens arranged in such a state that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element, and is configured, A light-emitting element array, characterized in that light-shielding means is provided between each pixel on the emission surface side of the cylindrical lens. 5. A cylindrical axis extends parallel to the linear array direction of the light emitting elements at a position immediately before the N light emitting elements linearly arrayed corresponding to the N pixels. As the cylindrical lens arranged in such a state that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element, and is configured, A light emitting element array, characterized in that an opening is provided for each pixel on the exit surface side of the cylindrical lens. 6. A cylindrical axis extends in parallel with the linear array direction of the light emitting elements at a position immediately before the N light emitting elements linearly arrayed corresponding to the N pixels. And a light emitting element array in which the cylindrical lenses are arranged such that the width of the cylindrical lens in the direction orthogonal to the cylindrical axis is equal to or less than the pixel pitch of the light emitting element. An image forming lens for forming an image of light emitted from a cylindrical lens in the light emitting element array on a predetermined image forming surface, and the light emitting surface of the light emitting element and the main plane of the image forming lens are in a conjugate relationship. A device for utilizing a light-emitting element, wherein the cylindrical lens is arranged, and the image forming lens is arranged so that the principal plane of the cylindrical lens and the image forming surface are in a conjugate relationship.