JPS6136161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical image detection device that forms an optical image on a photoelectric element array consisting of a plurality of photoelectric elements, and detects information of the optical image by photoelectrically converting the optical image. In particular, it is suitable for an optical image displacement detection device that detects the relative displacement of an optical image on a photoelectric element array.

2. Description of the Related Art Many devices for detecting an optical image formed on a photoelectric element array using image output from the array have been proposed in various fields, including automatic focus detection devices for cameras and the like. However, in such an optical image detection device, the array and the optical image thereon are displaced relative to each other due to vibrations, etc., and a portion of the optical image that was previously located outside the array enters the array. This causes a situation in which a portion of the optical image within the array exits outside the array.

If the light image portions entering or leaving the array are, for example, extremely bright compared to the light image portions on the array, the entering and exiting light image portions will generally not be reflected in the light image detection results. This greatly affects the detection accuracy and causes a decrease in detection accuracy.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical image detection device that can reduce the influence of the optical image portion entering and exiting the end of a photoelectric element array.

The optical image detection device according to the present invention includes a photoelectric element array consisting of a plurality of photoelectric elements arranged at or near the image forming plane of the optical system, in order to photoelectrically convert the optical image formed by the optical system. a processing circuit that processes the photoelectric element outputs of the plurality of photoelectric elements to create a detection output related to an optical image; and reducing means for reducing the photoelectric element output from the section to a level lower than the extent that it contributes to the detection output.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the basic configuration of the embodiment, in which 12 photoelectric elements P ₁ to 1 are spatially arranged one-dimensionally.
A photoelectric element array 2 consisting of P ₁₂ is arranged at or near the focal plane of an optical system (not shown). When an optical image with a certain brightness distribution is formed on this array 2 by this optical system, each element Pn (n=1...12)
is the electrical output f related to the intensity of the incident light on itself
occurs. For convenience, photoelectric element P ₁ of this array 2
~ Divide P ₁₂ into 3 groups. That is, in elements P ₁ to _{P 4} , P ₅
.about.P ₈ and P ₉ to P ₁₂ constitute a first group, a second group, and a third group, respectively. The intensity of light incident on the n-th photoelectric element from the left in the m-th group is expressed ^{as m} _o , and the output of that element is expressed as f ^m _o . The output f ^m _o of each photoelectric element P is sent to four adders 6 via a sensitivity reduction means 4 to be described later.
It is sent to addition means 6 consisting of a, 6b, 6c, and 6d. 6a is the element P ₁ located at the beginning of each element group,
6b is the output of the _second element P ² _, P ⁶ _, P ¹⁰ of each element group, and 6c and 6d are the outputs of the second element P ₂ , _{P 6 , and} P ₁₀ of each element group. Add the third and fourth element outputs, respectively. The vectorization means 8 includes 6a, 6
Vector quantities e 2 〓 ^{× (1/4)i} , e ² 〓 × ( ^2/4 ) whose phases are sequentially shifted by 2π × 1/4 in the outputs of b, 6c ^, and 6d.
It has vectorization circuits 8a, 8b, 8c, and 8d that multiply by ⁱ , e ² 〓 ^×(3/4)i , and e ² 〓 ^×(4/4)i . Therefore, the first element outputs f ¹ ₁ , f ² ₁ , f of each element group
³ ₁ has the vector quantity e ² 〓 ^×(1/4)i , the second element output f ¹ ₂ , f ² ₂ , f ³ ₂ has the vector quantity e ² 〓 ^×(2/4)i , and the second The third and fourth element outputs f ¹ ₃ , f ² ₃ , f ³ ₃ ,
For f ¹ ₄ , f ² ₄ , f ³ ₄ , e ² 〓 ^×(3/4)i and e ² 〓 ^×
(4/4)i
are multiplied respectively. Adder 10 sums the outputs of 8a-8d.

Therefore, the output I of the adder 10 is becomes.

The above example was for a case where the number of groups was 3 and the number of photoelectric elements in each group was 4, so if we generalize this to the number of groups M and the number of elements in each group N, the above output I is becomes.

As can be seen from this equation, the output I is the Fourier component of the brightness distribution of the image on the element array 2, that is, if the spatial length of each element group is dmm, the output I is the Fourier component of the luminance distribution of the image on the element array 2.
It is a spatial frequency component of mm.

In this way, the photoelectric elements of the element array 2 are divided into a plurality of element groups, and for each group, the outputs of the elements belonging to the same position in each group are, for example, f ¹ ₁ , f ² ₁ , f ³
₁
For example, e ² 〓 ^×(1/4)i
, and within each group, the outputs of all elements in array 2 are multiplied by a predetermined vector quantity so that the output of each element in that group is multiplied by a vector quantity whose phase increases sequentially in the order in which the elements are arranged. By multiplying by , a specific Fourier component, that is, a spatial frequency component that is the reciprocal of the length d of the element group, can be extracted as the output I of the adder 10 from the optical image formed on the array. Next, consider the change in the output of the adder 10 when the optical image on the element array is displaced by one photoelectric element to the left in FIG. Since the optical image is displaced by one element to the left, the photoelectric element output of magnitude f ^m _o has a vector quantity e ² whose phase is shifted by 1/N from before the displacement.
〓 ^× 〓〓 ⁱ is multiplied, and the output I' of the adder 10 at this time is as follows.

Here, the second term on the right side is −f ¹ ₁ e ² 〓 ^×(O/N)i
_The light ¹¹ that was incident on the leftmost element _P1 of the array before the displacement of the optical image is located outside the array after the displacement, so this is taken into consideration, and the third term is Due to the displacement, light M ⁺ 1 newly enters the photoelectric element P ₁₂ at the right end of the array. Output f of P ₁₂ due to ₁ ^M+1
₁ was taken into consideration. Arranging the formula, becomes. In this equation, the second term in { } indicates the influence of the part of the image that entered the array and the part of the image that went out from there due to the displacement of the image, and this term is the first term. If it is sufficiently small compared to , and can be ignored, this first term is the output I itself before displacement, so the difference between the outputs I and I' of the adder 10 before and after displacement is e ² 〓 ^{× (1/N)} The only point is that ⁱ is added to the output I'. This shows that when the image is laterally shifted by exactly one element width, the phase of the output of the adder 10 increases or decreases by 2π/N depending on the direction of the lateral shift. In the above example, the displacement of the optical image for one element was considered, but of course, the displacement of the optical image for two elements or three elements was considered.
If the displacement is for an element, the output of 4 or 6 elements will appear after the second term in { } of the above equation, so if this is so small that it can be ignored in the first term, the output after the displacement will be Output I′ is 2π×2/N or 2
The phase will change by π×3/N.

Neglecting the second term above is due to the displacement of the image.
This is true in the case of an optical image with a brightness distribution such that the intensity of light entering one end is almost equal to the intensity of light exiting from the other end, but it is not true in the case of an optical image in which this is not the case.

Therefore, the present invention employs the above-mentioned sensitivity reduction means in order to ensure that the relative displacement between the optical image and the element array is expressed as a phase displacement of the output I, regardless of the luminance distribution of the optical image. It is set up.

The function of this sensitivity reduction means 4 is as follows:
By making the terms other than the first term sufficiently small, the element output related to the intensity of light entering one end of the array and exiting from the other end due to image displacement can be made sufficiently small. Also, indirectly, by electrically multiplying the related element output by a coefficient, the effect of the related output on the adder output I can be made sufficiently small.

Therefore, the position of the sensitivity reducing means 4 in the apparatus shown in FIG. 1 is not limited to the illustrated position, but may be incorporated, for example, in the element 2 or the vector means 8 itself, as shown in the embodiments described later. be.

Next, a first embodiment of the present invention will be described with reference to FIG. In FIG. 2, a sine wave AC voltage supply circuit 1
2 are its four output terminals 12a, 12b, 12
As shown in FIGS. 3a, 12d, and 12d, sine wave voltages having the same angular frequency ω ₀ but sequentially delayed in phase by 2π/4 are generated. The output terminal 12a is connected to one terminal of the first photoconductive element P ₁ , P 5 , P ₉ in each group of the element array 2, and the other output terminals 12b, 12c, 12d are similarly connected to one terminal of the first photoconductive element P 1 , P ₅ , P 9 in each group. Photoconductive elements P ₂ corresponding to the arrangement order,
They are connected to P ₆ , P ₁₀ , P ₃ , P ₇ , P ₁₁ , P ₄ , P ₈ , and P ₁₂ , respectively. As a result, the output current of each photoconductive element becomes proportional to the intensity of light incident thereon and the applied alternating current voltage. That is, the output current of each element, which is proportional to the light intensity, is modulated by the applied AC voltage. The terminals of each photoconductive element that are not connected to the output terminals 12a to 12d are all connected together by a conductive wire 13 and connected to a current-voltage conversion circuit 14 comprising an operational amplifier.
Therefore, the output currents of each photoconductive element are all added together and input to the conversion circuit 14. As shown in FIG. 4a, this added output current has an angular frequency of ω ₀ and has information of a spatial frequency component of 1/d lines/mm of the optical image. This addition output current is the converter circuit, 1
4 is converted into a voltage, and the AC component shown in FIG. 4b is extracted by a bandpass filter 16 with an angular frequency ω ₀ . The amplitude of this alternating current is the desired 1/d
It is proportional to the size of the spatial frequency component in lines/mm. The phase difference between the output of the bandpass filter 16 and the output from any one of the four output terminals (12d in FIG. 2) of the sine wave voltage supply circuit 12 is determined by the phase difference measuring circuit 18. and,
Phase information about a desired spatial frequency component can be obtained, which allows the displacement of the optical image to be detected.

Comparing the components of this first embodiment with those shown in FIG. 1, the sine wave voltage supply circuit 12 corresponds to the vectorization means 8, and the other terminals of each photoconductive element are connected to each other. The conducting wires 13 correspond to the adding means 6 and 10, and the shape of the light receiving surface of the photoconductive element 2 corresponds to the sensitivity reducing means 4.

Next, to explain the shape of this element array in detail, the maximum length of each photoelectric element in the arrangement direction of the array is kept equal, the light receiving areas of the photoelectric elements P ₅ to _{P 8} of the second group are all equal, and the photoelectric elements of the first group are , the light-receiving areas of the second group of photoelectric elements P ₁ to P ₄ and P ₉ to P ₁₂ are configured to gradually decrease as the elements are closer to the ends of the array. Since the light-receiving area of the photoelectric elements near both ends of the array is decreased toward each end of the array,
The element outputs near both ends have less influence on the final output I than the element outputs near the center, and decrease smoothly, so that the change in phase of the output I with respect to image displacement can be made smooth.

This smooth reduction in the light-receiving surface area can be made even more effective by smoothly reducing the length of each element in the direction perpendicular to the array arrangement direction toward the end of the array, as in this example. becomes.

In particular, a shape that converges the shapes of elements P ₁ and P ₁₂ located at both ends of the array to one point in the arrangement direction, that is,
The triangular shape is important because the influence of the elements at both ends is particularly large.

In the above example, the light-receiving areas of the elements near the center of the array 2 were made equal to each other, and the light-receiving areas of the elements near both ends were changed linearly, but of course the array 2 could be configured as shown in FIG. The shape of the light-receiving surface of the entire element may be changed in a curved manner so that the light-receiving area of each element decreases smoothly from the center toward both ends.

In addition, as shown in FIG. 2 or 3, when changing the light-receiving surface area of the elements, a set of elements P ₁ , P ₅ ,
_P9 , _P2 , _P6 , _P10 , _P3 , _P7 , _P11 and _P4 , _P8 , _P12
In other words, when the light-receiving surface area of element Pn is Pns, P _1s
+P _5s +P _9s =P _2s +P _6s +P _10s =P _3s +P _7s +P ₁
It is preferable to set it so that _1s = P _4s + P _8s + P _12s .
The reason for this is that when an image with a uniform volatility distribution is formed over the entire light-receiving surface of the array, the output of the circuit 14 becomes zero.

Next, a second embodiment of the present invention will be described with reference to FIG. The light guide elements of the element array used in this embodiment may be any type of element as long as it converts light intensity into an electrical signal approximately proportional to the light intensity. Therefore, photoconductive elements such as CdS, photovoltaic elements such as silicon photovoltaic cells, photodiodes, etc. can be used. In FIG. 6, a constant voltage +V is applied to each photoelectric element of the element array 2, so that each photoelectric element outputs a direct current approximately proportional only to the light intensity. The first element of each group P ₁ , P ₅ ,
The output terminals of P ₉ are both connected to the output terminal 2a of array 2, so the outputs of those three elements are summed. Similarly, the corresponding elements P ₂ , P ₆ ,
P ₁₀ , P ₃ , P ₇ , P ₁₁ and P ₄ , P ₈ , P ₁₂ are connected to output terminals 2b, 2c, 2d, respectively, and the respective outputs are added there. In this way, the sum of the three outputs is 4
The two summed output currents are each output from the current-voltage conversion circuit 22.
It is converted into a DC voltage by a, 22b, 22c, and 22d. This DC voltage is shown in FIGS. 7a, b, c, and d. That is, _the DC voltages in Figure 7 a, b, c _, and d are the sum of the light intensities _{P 2 ,} P ₆ ,
It has a value proportional to the total light intensity of _P10 , the total light intensity of _P3 , _P7 , and _P11 , and the total light intensity of _P4 , _P8 , and _P12 . The modulation circuit 24 modulates the DC voltages a, b, c, d in FIG. 7 into AC voltages a, b, c, d in FIG. 8, respectively. These alternating voltages both have the same angular frequency ω ₀ , but their amplitudes are each proportional to the direct voltage in FIG. 7, and their phases are 90
It is delayed by ゜. The adder circuit 26 is the modulator circuit 24
The angular frequency ω shown in Fig. 9 is obtained by adding the four outputs of
It emits an AC output of ₀ . The amplitude of this AC output is 1/
It is proportional to the magnitude of the spatial frequency component of d lines/mm, and corresponds to the output of FIG. 4a of the first embodiment. Thereafter, the output of this adder circuit 26 is transferred to the bandpass filter 16 and the phase difference measuring device 18 as in the first embodiment.
The desired information can be obtained by passing the .

In this second embodiment, a density filter 28 that covers the entire light-receiving surface of the element array 2 is used as the sensitivity reduction means 4.
Use. This filter 28 has a transmittance T on the vertical axis.
As shown in FIG. 10, in which the photoelectric element position is plotted on the horizontal axis, the array has a transmittance distribution characteristic in which the light transmittance near both ends of the array decreases smoothly toward each end. Of course, this filter also applies to the adder 2 when an image with uniform luminance distribution is formed on the entire array 2.
It is preferable to determine the transmittance characteristics so that the output of 6 becomes zero.

Further, it is more preferable to form a filter having such a transmittance distribution characteristic as a single layer or multilayer film on the light receiving surface of the array 2 by a method such as vapor deposition, and to configure the film as an antireflection film.

FIG. 11 shows a specific example of the modulation circuit 24.
The sine wave voltage supply circuit 24S is the same as the voltage supply circuit 12 shown in FIG. 2, and its four output terminals each have an angular frequency whose phase is delayed by 2π/4 as shown in FIG. 3 a, b, c, and d. Generates an alternating current voltage of ω ₀ .
Multipliers 24a, 24b, 24c, 24d are current-voltage conversion circuits 22a, 22b, 22c, 22, respectively.
The output voltage of d is multiplied by the output voltage of the voltage source 24S that is sequentially delayed by 2π/4.

In the above two embodiments, the photoelectric element output related to light intensity was modulated with an AC signal to extract a desired spatial frequency component.Next, we will explain a third embodiment using a different method. This will be explained with reference to FIG.

In FIG. 12, for generality, it is assumed that the element array 2 is composed of M element groups, and each group is composed of N photoelectric elements. In the figure, only three photoelectric elements in each of the first element group and the M-th element group are shown. The output of each element is amplified by an amplifier 30 connected to each element. The amplified outputs are added by the adding means 32 for each element in the corresponding position of each group. For example, the outputs f ¹ ₁ . . . f ^M ₁ of the elements in the first position of each group are added by the adder 32a of the adding means. Similarly, for example, the output f ¹ _o ... f ^M _o of the n-th element, and the output f ¹ _N ... f ^M _N of the n-th element are the adder 30n,
30N is added. Then, the vectorization means 8 applies vector quantities e ⁱ² 〓 ^×1/N to the outputs of these N adders 30a...30n...30N (only three are shown in the figure), respectively. ⁱ² 〓 ^×n/N ……
...e ⁱ² 〓 Multiply ^×N/N in the form of x and y components of each vector quantity. For example, the multiplier 8
By ax, e ⁱ² 〓 ^x1/N x component cos2π×
1/N is calculated by 8ay to calculate its y component sin2π×
Multiply by 1/N, similarly, the output of 30n is 8nx,
8ny, respectively cos2π×n/N and sin2π×n/N
Also, for the output of 30N, 8Nx and 8Ny are used respectively.
Multiply by cos2π×N/N and sin2π×N/N. Then, the adder 34x multiplies the x component by the multiplier 8ax...
...8nx...The output of 8Nx is also added to the adder 34y.
adds the outputs of the y-component multipliers 8ay...8ny...8Ny. Therefore, if the outputs of 34x and 34y are X and Y, respectively, becomes. In this way, the vector quantity I determined by the outputs X and Y represents a spatial frequency component of 1/d lines/mm of the optical image, assuming that the length of each element group is d as described above. This vector quantity I(X,Y)
The deflection angle α increases or decreases with the displacement of the optical image. In this embodiment, in order to reduce the influence of the output of the photoelectric elements near both ends of the array described above on the change in the deflection angle α, the amplification factor of the amplifier 30 that amplifies the output of the elements near both ends of the array is changed to The smaller the element is, the closer it is to . That is, in this embodiment, the amplifier 30 functions as the sensitivity reduction means 4. Next, let's find the declination angle α.

The outputs X and Y vary greatly not only due to the brightness distribution of the optical image with respect to the element array but also due to changes in the brightness of the optical image. Therefore, the calculation circuit 3 calculates the absolute value √ ₂ + ₂ of the vector I, which changes depending on the brightness of the image.
6, the output of this circuit 36 is √ ² +
Arithmetic circuit 38x from Y ² and output X of circuit 34x
Calculate X/√ ² + ² = X ₀ . Similarly √
From ² + ² and Y, the arithmetic circuit 38y calculates Y/
Calculate √ ² + ² = Y ₀ . This standardized value
X ₀ and Y ₀ are unrelated to the brightness of the optical image.

There are various methods for determining the argument α of the vector I from the normalized outputs X ₀ and Y ₀ because α is a multivalued function of X ₀ and Y ₀ . For example, the simplest method is to calculate α=tan ⁻ ₁ Y ₀ /X ₀ . However, with this method, the range that is uniquely determined is −
π/2<α<π/2. In this embodiment, a method is adopted in which α is uniquely determined within the range -π<α<π, which is wider than this range. To explain in detail
Using X ₀ and Y ₀ as input, calculate 2sin ^-1 {√(1− ₀ ) ²
+Y ² ₀ /2} and a sign determination circuit 42 that determines whether Y ₀ is positive or negative. Based on the outputs of both circuits 40 and 42, the α calculation circuit 44 calculates Y ₀
When Y 0 is a positive value, the output of the arithmetic circuit 40 is output as is based on the output of the circuit 42, and when Y ₀ is negative, the output of the arithmetic circuit 40 is given a negative sign and output. As described above, this increase or decrease in α corresponds to the amount and direction of displacement of the optical image on the element array in the array direction of the array.

Next, FIG. 13 shows a configuration that embodies the block diagram of FIG. 12. In this specific example, M=3, N=
8, the element array 2 consists of 24 photoelectric elements P such as photoconductive elements and photodiodes, and one end of these photoelectric elements is connected to a common wire 50 and connected to a power source (not shown), and the other end is connected to a power source (not shown). 8 output terminals 5 connected to each other every 8 times and corresponding to each other
1, 52, 53, 54, 55, 56, 57, 58
connected to one of the Therefore, the sum of the output currents of every eight elements appears at these eight output terminals 51-58. Each output current is converted into an output voltage by a current-voltage conversion circuit 59 having eight circuits. The vectorization means 8 sequentially multiplies the outputs 51 to 58 related to the light intensity by vectors whose polarization angles are shifted by 2π/8, so the x components of these eight vectors, x ₁ =cos0/8×2π, x ₂ = cos1/82π, x ₃ = cos2/8×2π, x ₄ = cos3/82π, x ₅ = cos4/8×2π, x ₆ = cos5/8×2π, x ₇ = cos6/8×2π, x ₈ = cos7/8×2π And its y component y ₁ = sin0/8×2π, y ₂ = sin1/8×2π, y ₃ = sin2/8×2π, y ₄ = sin3/8×2π, y ₅ = Multiply by sin4/8×2π, y ₆ = sin5/8×2π, y ₇ = sin6/8×2π, y ₈ = sin7/8×2π. Outputs 51 to 58 contain the x component of the vector x ₁
A specific configuration for multiplying by ~x ₈ is to prepare resistors R ₁ to R ₈ whose resistance values are inversely proportional to the absolute value of this x component, and connect resistor R 1 to output 51 and resistor R ₁ to output 52.
Connect each output 51 to 58 to one end of the corresponding resistor R ₁ to R ₈ such that R ₂ is connected, and the resistors R corresponding to those whose x component has a positive value x ₁ , x ₂ , x _{8 1} ,
The other ends of R ₂ and R ₈ are connected to a subtracter 61 via an adder 60.
and the other ends of resistors R ₄ , R ₅ , R ₆ corresponding to those whose x components have negative values x ₄ , x ₅ , x ₆ are connected to one input terminal of the subtracter 61 via an adder 62 . Connect to the other input. As a result, the output of the subtractor 61 is
is obtained.

Note that since x ₃ =x ₇ =0, the resistance values of R ₃ and R ₇ are infinite, so the outputs 53 and 57 are not connected to the vectorization circuit regarding the x component. In addition, the outputs 51 to 58 are multiplied by the y components y ₁ to y ₈ of the vector using the same method using the resistors R ₁ ′ to _{R 8} ′ and the adder 6.
This is done using 0', 62' and a subtracter 61'. As a result, Y is obtained as the output of the subtracter 61'.

As is clear from the above description, according to the present invention, the extent to which the photoelectric element output from the ends of the photoelectric element array contributes to the detection output is greater than the extent to which the photoelectric element output from the center of the array contributes to the detection output. This reduces the influence of the optical image entering or exiting the edge of the array, thereby improving detection accuracy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the principle of an optical image displacement detecting device according to the present invention, FIG. 2 is a block diagram showing an embodiment of the displacement detecting device shown in FIG. 1, and FIGS. FIG. 2 is a waveform diagram necessary for explaining the displacement detection device shown in FIG. 2, FIG. 5 is a side view showing another shape of the photoelectric element array shown in FIG. 2, and FIG. A block diagram showing an embodiment; FIGS. 7 to 9 are waveform diagrams necessary for explaining the displacement detection device shown in FIG. 6; FIG. 10 is a diagram showing the light transmittance distribution of the filter shown in FIG. 6; 11th
The figure is a block diagram showing a specific configuration of the modulation circuit shown in FIG. 6, FIG. 12 is a block diagram showing a third embodiment of the displacement detecting device according to the present invention, and FIG. 13 is a block diagram showing the displacement detecting device shown in FIG. 12. FIG. 2 is a circuit diagram showing a specific configuration of the device.

[Table] Force generation means addition means 10 Adder

Claims (1)

[Scope of Claims] 1. A photoelectric element array consisting of a plurality of photoelectric elements disposed on or near the imaging plane of the optical system in order to photoelectrically convert an optical image formed by the optical system; means for multiplying each photoelectric element output viewed in the order of arrangement of the photoelectric elements by a multiplier whose phase increases periodically, and an addition means for adding the outputs of each photoelectric element multiplied by the multiplier, the photoelectric element a processing circuit that processes the output of the photoelectric elements to create a detection output related to an optical image, and gradually increases the light receiving area of the plurality of photoelectric elements near both ends of the element array toward each end of the array. reducing the extent to which photoelectric element outputs from the ends of the array contribute to the detection output than the extent to which photoelectric element outputs from the center of the array contribute to the detection output. Optical image detection device. 2. The optical image detection device according to claim 1, wherein the sum of the light receiving areas of the photoelectric elements to which the multiplier of the same phase is multiplied is all equal. 3. The lengths of each of the photoelectric elements in the array direction are made approximately equal to each other, and for the plurality of photoelectric elements near both ends, the length of the photoelectric elements in the direction perpendicular to the array direction is made to be oriented toward each end of the element array. Claim 1, characterized in that the light-receiving area is reduced by gradually reducing the light-receiving area.
The optical image detection device described in . 4. The light according to any one of claims 1 to 3, characterized in that the shapes of the photoelectric elements located at both ends of the array are determined so that both ends of the element array converge to approximately one point. Image detection device. 5. A photoelectric element array consisting of a plurality of photoelectric elements disposed on or near the imaging plane of the optical system in order to photoelectrically convert the optical image formed by the optical system; means for multiplying each photoelectric element output by a multiplier whose phase increases periodically, and an addition means for adding the outputs of each photoelectric element multiplied by the multiplier, and processing the photoelectric element output of the photoelectric element. a processing circuit for generating a detection output regarding a light image; An optical image detection device characterized by comprising: a reduction means for reducing the amount by more than . 6. A patent characterized in that the reducing means is a filter provided in front of the light-receiving surface of the element array, and the light transmittance distribution characteristic of the filter gradually decreases toward both ends of the element array. The optical image detection device according to claim 5. 7. The reducing means includes a number of amplifying means corresponding to the number of photoelectric elements that amplify the outputs of the plurality of photoelectric elements near both ends of the array, and the amplifying means corresponding to the photoelectric elements closer to both ends of the array are more amplifying means. The optical image detection device according to claim 5, characterized in that the amplification factor is reduced.