JPH0524193Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a luminance distribution measuring device for measuring the distribution of luminance due to the luminous output of a surface-emitting object.

[Prior Art] A luminance distribution measuring device is used as a device to determine whether or not a luminous body, which is an object that emits light from a surface, emits light from a surface, by measuring the distribution of luminance due to the light output of the luminous body. There is. Conventional CCD (chargecoupled)
There is one using device). In this method, the light-receiving surface on the CCD side is divided according to the number of measurement points of the light emitter, and the brightness is measured. Furthermore, there is a method that measures the brightness at a predetermined point by moving a photodetector having a pinhole formed in the light receiving part over the light emitting surface of the light emitter. moreover,
In addition, there is also a method in which brightness is measured by bundling a plurality of fibers that are optical waveguides and detecting the light output from the light emitter.

[Problems to be solved by the invention] However, all of the above-mentioned luminance distribution measuring devices have the following problems.

That is, devices using CCDs had the disadvantage that the CCD itself, which is a light-receiving element, was expensive.
Additionally, those using a photodetector with a pinhole require a moving device to move the photodetector two-dimensionally, and this moving device is expensive and has a complicated structure. It was hot.
Furthermore, since the measurement points on the light emitting surface are selectively changed by moving the photodetector using a moving device, there is a problem in that it takes time to move the photodetector, which slows down the measurement speed. Ta.
Furthermore, those using fibers as optical waveguides have the disadvantage that each time the number of measurement points on the light emitting surface increases, more fibers are required, which increases the cost of the device. Furthermore, since this device uses a plurality of fibers depending on the number of measurement points, there is a problem in that it is necessary to prepare as many light receiving elements as the number of fibers, or to provide an optical path switch between the fibers.

The present invention was developed in view of the above-mentioned problems, and its purpose is to measure luminance distribution, which has a simple structure and can be constructed at low cost, and which can measure luminance according to measurement points on the light-emitting surface of a light-emitting body. The goal is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, the brightness distribution measuring device according to the present invention is provided corresponding to the light-emitting surface of the surface-emitting object 1, and is provided at a position corresponding to a measurement point on the light-emitting surface. a first slit plate 4 having through holes 2;
a second slit plate 5 which is provided corresponding to the first slit plate and has a through hole 3 at a position that coincides with the through hole 2 by relative movement, and the first slit plate Alternatively, a moving means 6 for moving at least one of the second slit plates;
It is characterized by comprising a photodetector 7 that receives and detects light from the light emitting surface that passes through the through holes 2 and 3 of the first slit plate and the second slit plate at the same time.

[Function] When the light emitter 1 is positioned at a predetermined position, the first
Either the slit plate 4 or the second slit plate 5 is moved by the moving means 6, and this relative movement causes the through holes 2 and 3 formed in each of the slit plates 4 and 5 to be moved in order. Polymerizes and appears. The light passing simultaneously through the through holes 2 and 3 of each slit plate 4 and 5 is received and detected by the photodetector 7 to measure the light output at each measurement point. Measures the distribution of brightness.

[Example] Fig. 1 is a plan view showing an embodiment of the luminance distribution measuring device according to the present invention, Fig. 2 is a side view of the same device, Fig. 3 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a side view of the device. FIG. 4 is a partial sectional view showing the first and second slit plate portions of the same device.

The luminance distribution measuring device (hereinafter referred to as measuring device) according to this embodiment positions a surface-emitting light emitter 1 at a predetermined position, and has first and second through holes 2 and 3 formed in correspondence with measurement points. One of the slit plates 4 and 5 of No. 2 is moved by the moving means 6.
The photodetector 7 detects the light emitted from the light emitter 1, which simultaneously passes through the through holes 2 and 3 of the first and second slit plates 4 and 5, which are superimposed by this relative movement. The luminance distribution state according to the light emitting output of the light emitting body is measured.

A recess 9 is formed in the center of an outer frame 8 having a U-shaped cross section in the measuring device. This recess 9
A conveyor belt 10 carrying a light emitter 1 is movable inside. This conveyor belt 10 moves in the direction of the arrow B in FIG. When it is conveyed to the center, it is stopped there and positioned. Here, the conveyor belt 10
The light emitter 1 placed on top emits light from a surface, such as a liquid crystal, a light emitting diode, a cathode ray tube, or the like.
This is based on electroluminescence, etc.

A first slit plate 4 is attached to a step 11 formed in the recess 9 of the outer frame 8 so as to face the light emitting surface of the light emitter 1. This first slit plate 4 has through holes 2 formed at positions that serve as measurement points for detecting the light emitted from the light emitter 1. The number and position are determined in advance.

Further, a central shaft 13 to which a roller 12 is attached is pivotally supported at both ends of the outer frame 8. An endless belt constituting the second slit plate 5 is attached to the roller 12, and a portion of the endless belt overlaps with the first slit plate 4. This endless belt is always movable in the direction of arrow C in FIG. 1 by driving a motor as moving means 6. Further, a through hole 3 having a larger diameter than the through hole 2 formed in the first slit plate 4 is formed in the endless belt. This through hole 3 is formed along the moving direction of the endless belt so as to coincide with the through hole 2 of the first slit plate 4 when the endless belt moves in the direction of arrow C. Accordingly, only one through hole 2, 3 is always overlapped so that the light from the light emitting body 1 can pass therethrough. Therefore, the light output of the light emitter 1 can always be measured at one measurement point.

Note that the number and position of the through holes 3 and the through holes 2 are predetermined in accordance with the number of measurement points of the light emitting body 1.

Further, a photodetector 7 is provided at a position facing the light emitter 1 with the first and second slit plates 4 and 5 in between. This photodetector 7 is for receiving and detecting the output light from the light emitter 1 that has simultaneously passed through the through holes 2 and 3 of the first and second slit plates 4 and 5.

In the configuration described above, when the light emitting body 1 to be measured first is conveyed to the recess 9 of the outer frame 8 and stopped, the light emitted from the light emitting body 1 is transmitted to the second slit plate 5. By moving an endless belt, only the light that passes through the through holes 2 and 3 of each slit plate 4 and 5 at the same time is sequentially transmitted to the photodetector 7.
The light is received and detected by the light emitter 1, and the luminance distribution state at each measurement point of the light emitter 1 is measured. At this time, since the photodetector 7 is fixed, it is possible to stably receive and detect the light from the light emitting surface and obtain accurate measurement results. Thereafter, the next light emitter 1 is moved to the measurement position by driving the conveyor belt 10, and the luminance distribution state at each measurement point is measured for each light emitter. Next, FIG. 5 shows another embodiment of the second slit plate.

This second slit plate 15 is an endless belt that moves on a straight line, whereas the above-mentioned one is an endless belt that moves on a straight line.
It is formed in the shape of a disk, and like the endless belt described above, through holes 3 are formed on its surface at positions that coincide with the through holes 2 of the first slit plate 4 when the belt rotates.

Incidentally, in the above-described embodiment, the first and second slit plates 4 and 5 were provided in a superposed state, but as shown in FIG. By configuring the light emitting body 1 at a distance from
(far-field pattern), etc. can be measured.

[Effect of the invention] As explained above, according to the luminance distribution measuring device according to the invention, by the relative movement of the first and second slit plates, the penetrations formed in each slit plate corresponding to the measurement points are The holes overlap one after another, and only the light that passes through the through-holes at the same time is detected by the photodetector, so it is possible to measure the brightness according to the measurement point on the light-emitting surface of the light-emitting body. The device can be manufactured at low cost with an extremely simple structure. Furthermore, since the photodetector does not need to be moved, the output light from the light emitter can be stably received, and the measurement results are reliable. Furthermore, the measurement point can be easily changed by changing the position of the through hole in the slit plate.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the luminance distribution measuring device according to the present invention, Fig. 2 is a side view of the same device, Fig. 3 is a sectional view taken along line A-A in Fig. 1, and Fig. 4 is the same. A partial sectional view showing the first and second slit plate portions in the device, FIG. 5 is a diagram showing another embodiment of the second slit plate in the same device, and FIG. FIG. 3 is a partial cross-sectional view showing a state when the distance between the slit plates is increased. 1... Light emitter, 2, 3... Through hole, 4... First
slit plate, 5... second slit plate (endless belt), 6... moving means, 7... photodetector, 15
...Second slit plate.

Claims (1)

[Scope of utility model registration request] a first slit plate 4 provided corresponding to a light emitting surface of a surface emitting object 1 and having a through hole 2 at a position corresponding to a measurement point on the light emitting surface;
A through hole 3 is provided corresponding to the slit plate, and a through hole 3 is formed in a position corresponding to the through hole 2 by relative movement.
a second slit plate 5 having a second slit plate, a moving means 6 for moving at least one of the first slit plate and the second slit plate, and a moving means 6 for moving at least one of the first slit plate and the second slit plate; hole 2,
3 and a photodetector 7 that receives and detects light from the light emitting surface that passes through the light emitting surface at the same time.