JPH04284095A - Picture inspecting device - Google Patents

Abstract

PURPOSE:To gain the structure able to confirm which part is measured in the case of measuring the luminance or the like of a color picture. CONSTITUTION:A photodiode 25 for G is movably fitted to a main body 18 of a sensor so as to switch the position with an imaging device 28 of an adjacently arranged camera part 29. When the imaging device 28 is arranged at a position corresponding to a beam splitting prism 20, in the color picture, the image of a part made incident to a lens system 19 can be picked up by the camera part 29. Therefore, while observing the image picked up by the camera part 29 on a monitor television, the measured position and range can be confirmed or focusing, etc., is enabled.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen inspection device for measuring the brightness, chromaticity, etc. of color screens such as LCDs and CRTs.

0002

[Prior Art] As a screen inspection device for measuring the brightness, chromaticity, etc. of color screens such as LCDs and CRTs,
A configuration as shown in FIG. 8 is possible.

This screen inspection device is provided with a lens system 1 and a spectroscopic lens 2, through which light emitted from a color screen 3 is transmitted to photodiodes 4 for R, G, and B (red, green, and blue). The system is such that the light enters into 5 and 6.

A G filter 8 is attached to the surface 7 of the spectroscopic lens 2 from which the transmitted light is emitted, an R filter 10 is attached to one surface 9 from which the refracted light is emitted, and an R filter 10 is attached to the other surface from which the refracted light is emitted. A B filter 12 is attached to the surface 11.

[0005] At the position corresponding to the R filter 10,
A photodiode 4 and a photoamplifier 13 for R are sequentially arranged, and a G filter 8 is located at a position corresponding to the filter 8 for G.
A photodiode 5 and a photoamplifier 14 for
A photodiode 6 and a photoamplifier 15 are arranged in this order.

[0006] Each photodiode 4, 5 for R, G, B
, 6 converts the amount of received light into a current and sends it to each of the R, G, and B photoamplifiers 13, 14, and 15. Each photoamplifier 13, 14, 15 converts the current sent from each photodiode 4, 5, 6 into a voltage, and converts the current sent from each photodiode 4, 5, 6 to an external signal processing section 16.
send to The signal processing section 16 includes each photoamplifier 13 and 14.
, 15, the white balance (R/G, B/G) is checked and the brightness, chromaticity state, etc. of the color screen 3 are measured.

In this example, the R, G, and B photodiodes 4, 5, and 6 are fixedly set at predetermined positions on the sensor body 17. Therefore, the light emitted from the spectroscopic prism 2 passes through each of the R, G, and B filters 10, 8, and 12, and enters each photodiode 4, 5, and 6 as it is.

[0008]

[Problems to be Solved by the Invention] However, in the case of such a structure, each of the R, G, and B photodiodes 4, 5,
6 cannot detect the position of the light emitted by the color screen 3, so there is a problem in that it is not possible to confirm which part of the color screen 3 is being measured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a screen inspection device that can confirm the measurement position and range of a color screen.

0010

[Means for Solving the Problem] The screen inspection device of the present invention allows light emitted from a color screen to enter each R, G, and B photodiode through a lens system and a spectroscopic prism, and outputs the light. In a screen inspection device that inspects the screen from the front, any one of the R, G, and B photodiodes is movable, and the position can be switched between it and an image sensor placed nearby. It is characterized by making it possible.

[0011]

According to the above structure, when one of the R, G, and B photodiodes is switched to the image sensor of the camera section, the light emitted from the spectroscopic prism enters the image sensor of the camera section. Therefore, the camera section can capture an image of the portion of the color screen that is incident on the lens system.

[0012] With this, it is possible to check the measurement position and range on the color screen and adjust the focus while viewing the image captured by the camera unit on the monitor television.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 7 show the configuration of an embodiment of a screen inspection device according to the present invention. Figure 1 is a vertical side view, Figure 2 is a cross-sectional plan view, Figure 3 is a front view, Figure 4 is a rear view, Figure 5 is A in Figure 1.
6 is a sectional view taken along line B-B in FIG. 1, and FIG. 7 is a sectional view taken along line C-C in FIG. 2.

This screen inspection device includes a sensor body 18, a lens system 19, a spectroscopic prism 20, filters 21, 22, 23 for R, G, and B, and photodiodes for R, G, and B. 24, 25, 26, each photoamplifier 27 for R, G, and B, and a camera section 29 having an image pickup device (CCD) 28.

The lens system 19 is an interchangeable lens having a predetermined magnification that can be attached to and detached from the sensor body 18, and is attached to a mount portion 30 provided at the center of one side (front side) of the sensor body 18 using, for example, a screw. It is mounted using a mounting method (this embodiment) or the like.

The spectroscopic prism 20 is mounted in the sensor main body 18 at a position corresponding to the mount section 30. The surface 3 of this spectroscopic prism 20 from which the transmitted light exits
1 has a G filter 22 attached to it, an R filter 21 is attached to one surface 32 from which refracted light is emitted, and a B filter 23 is attached to the other surface 33 from which refracted light is emitted.
is installed.

Each photodiode 24, 2 for R, G, B
5 and 26 are respective filters 21, 22, 2 for R, G, and B.
It is placed at a position corresponding to 3. Also, R, G, B
Each of the photoamplifiers 27 is housed in an amplifier housing section 34 formed at the rear lower part of the sensor body 18. Each photoamplifier 27 is connected to an external signal processing section (not shown).
electrically connected to.

The R photodiode 24 and the B photodiode 26 are fixedly installed at predetermined positions on the sensor body 18. Further, the G photodiode 25 is attached to the sensor main body 18 so as to be vertically movable in the up and down direction. This G photodiode 25 is located in a camera storage section 35 formed at the rear upper part of the sensor body 18.
The position of the camera section 29 is switched between the camera section 29 and the image sensor 28 housed therein.

G photodiode 25 and image sensor 2
8 is attached via support plates 38 and 39 to an elevating plate 37 that is movable up and down along a guide plate 36 vertically provided in the substantially central portion of the sensor main body 18 .

The elevating plate 37 is fitted into the guide rail 40 of the guide plate 36 (see FIG. 2).
along the guide plate 36 in the vertical direction. A spring for returning the lifting plate (
A coil spring) 41 is interposed.

The support plates 38 and 39 are detachably attached to the guide plate 36 by a plurality of bolts 42.

An operating lever 45 inserted through a vertical guide groove 44 formed on one side 43 of the sensor body 18 is connected to the elevating plate 37 (see FIG. 2), and the operating lever 45 can be moved in the vertical direction. As a result, the elevating plate 37 moves vertically on the guide plate 36.

The operating lever 45 is attached to the elevating plate 37 by a vertical shaft 46 (see FIG. 6), and can be rotated horizontally (in the direction of the arrow in FIG. 2) about this shaft 46. It has become. Further, the vicinity of the base end of the operation lever 45 is connected to the L of a guide plate 47 erected within the sensor main body 18.
It is designed to be guided by a letter-shaped guide groove 48 (see FIG. 7). Note that one side 43 of the sensor body 18
The vertical guide groove 44 formed in the groove 44 also has an L-shape.

When the operating lever 45 is located at the upper end of the guide groove 48 as shown in FIG. 7, the elevating plate 37 is biased by the spring 41 and is located at the upper limit position of the guide plate 36. . At this time, as shown in FIG. 1, the G photodiode 25 is connected to the spectroscopic prism 20 (the G filter
It is located in a position corresponding to 2).

Then, the operating lever 45 is moved downward against the biasing force of the spring 41 and rotated horizontally about the shaft 46 (see FIG. 2), so that the lower end bent portion 49 of the guide groove 48 When the guide plate 37 is fitted into the guide plate 36 (the state shown in the phase image diagram in FIG. 7), the elevating plate 37 moves to the lower limit position of the guide plate 36 and is fixed in position while being biased by the spring 41. At this time, the position is switched between the G photodiode 25 and the image sensor 28, and the image sensor 28 is placed at a position corresponding to the spectroscopic prism 20 (the state when confirming the measurement part) .

The operating lever 45 is inserted into the bent portion 4 of the guide groove 48.
9, the operating lever 45 and the lifting plate 37 move up to the upper limit position by the biasing force of the spring 41, and the G
The position is switched between the photodiode 25 and the image sensor 28 (state when performing measurement).

[0028] In this way, in this screen inspection device,
By moving the operating lever 45 in the vertical direction, the G
The positions of the photodiode 25 and the image sensor 28 can be switched. Then, when the image sensor 28 is switched to a position corresponding to the spectroscopic prism 20, the camera section 29 can capture an image of the portion of the color screen where the light enters the lens system 19.

Therefore, if a monitor TV is connected to the camera unit 29, it is possible to check the measurement position and range on the color screen and adjust the focus while viewing the image captured by the camera unit 29 on the monitor TV. Can be done. After confirming the measurement position, switch the operating lever 45, perform predetermined calculations (R/G, B/G, etc.) from the output of each photodiode 24, 25, 26, and measure the brightness, chromaticity state, etc. do.

In this embodiment, the positions are switched between the G photodiode 25 and the image sensor 28, but the R photodiode 24 or the B photodiode 26 and the image sensor The position may be switched between 28 and 28.

[0031]

Effects of the Invention As explained above, the screen inspection device of the present invention allows any one of the R, G, and B photodiodes to be movable, and also allows the image sensor disposed nearby to move. Since the position can be switched between 2 and 3, it is possible to check which part of the color screen is being measured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a screen inspection device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the screen inspection device.

FIG. 3 is a front view of the screen inspection device.

FIG. 4 is a rear view of the screen inspection device.

FIG. 5 is a cross-sectional view taken along line AA in FIG. 1;

FIG. 6 is a sectional view taken along line BB in FIG. 1;

7 is a sectional view taken along line CC in FIG. 2. FIG.

FIG. 8 is a longitudinal side view of an example of a conventional screen inspection device.

[Explanation of symbols]

19 Lens system 20 Spectroscopic prism 24 Photodiode for R 25 Photodiode for G 26 Photodiode for B 28 Image sensor 29 Camera section

Claims (1)

[Claims] 1. A screen inspection device in which light emitted from a color screen enters each R, G, and B photodiode through a lens system and a spectroscopic prism, and the screen is inspected from the output thereof. , any one of the R, G, and B photodiodes is movable;
Moreover, a screen inspection device is characterized in that the position can be switched between image pickup devices arranged nearby.