JPS6177827A - Crt image photographic device - Google Patents

Abstract

PURPOSE:To reduce the size of a device and to eliminate the need for correcting the distance between lenses and correcting the error in attaching a CRT by constituting the device in such a way that the light transmitted through the lens on the optical axis of the CRT is imaged to a film after the light is bent 90 deg. by a mirror and calculating and controlling the extent of the movement of the lens and body according to the setting of an image pickup magnification. CONSTITUTION:The lens 14 having a focal length (f) is disposed on the optical axis of the CRT and the light transmitted therethrough is bent 90 deg. by the mirror 16 and is imaged to a film 18. The lens is moved in the optical axis direction by a lens moving means. The body provided with the CRT10, the lens 14 and the mirror 16 is moved integrally in the direction orthogonal with the film plane by this moving means. The extent of the movement of the lens moving means and body moving means is controlled by a means for controlling the extent of movement. A means for inputting an (f) value and a means for setting photographing magnification are provided. The photographing position of m0 times is set as a reference position. The extent of the movement of the body is changed from the present position to (m+1/m-m0-1/m0)f and the extent of the movement of the lens is changed to (1/m-1/m0)f in the case of photographing at (m) magnification. The means for inputting the (f) value inputs the error DELTA for a design value f0 or the actual (f) value as it is. The photographing magnification (m) is determined by the photographing mode set by a means for setting photographing mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a CRT image capturing device that is mainly used for medical purposes and is capable of capturing a plurality of images on a single film.

[Prior Art] In a variable magnification CRT image capturing device, a mirror is disposed on the optical axis of the CRT, and the optical path is set in the horizontal direction, and then the CRT image is formed on a film via a lens. (Utility Model Laid-Open No. 59-25519), it is also possible to take pictures at any magnification by moving the CRT and lens. The amount of movement is determined in accordance with a value stored in advance in the microcomputer for each magnification.

[Problems to be solved by the invention] However, since a lens is interposed between the mirror and the film, and the magnification is changed by moving this lens, it is necessary to increase the depth of the device. There is a larger installation area.

Additionally, the focal length of lenses varies from product to product.
It was necessary to adjust the focus for each magnification.

[Means for solving the problems] In order to solve the above problems, a CRTmf according to the present invention is provided.
In the photographing device, a lens with a focal length f is arranged on the optical axis of the CRT, and the light that passes through this lens is bent by 90 degrees with a mirror to form an image on the film. The lens is moved in the direction of its optical axis by the lens moving means. Further, the main body including the CRT, lenses, and mirrors is moved integrally in a direction perpendicular to the film surface by the main body moving means.

The amounts of movement of these lens moving means and body moving means are controlled by movement amount control means. The movement amount control means is equipped with an f-value input means and an imaging magnification setting means, and m (1x imaging position is taken as a reference position, and in the case of mx imaging, the amount of movement of the main body is adjusted from the current position m1x imaging position. (m+l/m-mQ-1/mo)f, and the lens movement amount is set to (1/m-1/mg)f from m1 times the photographing position.

This f-value input means is configured to directly input the error Δ with respect to the design value f, or the actual f-value. In addition, the shooting magnification m is determined by the shooting mode set by the shooting mode setting means (including those that directly set the shooting magnification).
is now determined.

[Effect] Next, the operation of the above means will be explained.

As an initial adjustment, the m0 times photographing position (reference position) of the main body and lens is determined, and the error Δ with respect to the actual f value or design value fo is set.

When you set the shooting mode and start the CRT image shooting device, the main body moves from the reference position (m+
1/m-mQ-1/no) Move to a position away by f. Also, the lens moves from the reference position in the direction of its optical axis (
Move to a position 1/m-1/m(1)f away.

When these movements are completed, the CRT image can be captured on film.

[Example] An example of a CRT image capturing apparatus according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the CRT image capturing device A is a CRTIO
The image projected on the screen 12 is focused on a film 18 via a lens 14 and a mirror 16, and photographed. That is, the screen 12 of the CRTlO is arranged horizontally, the lens 14 is arranged on its front axis, the mirror 16 is arranged above it, the optical path is bent by 90 degrees, and the CRT is directed to the film 18 arranged vertically. It is designed to form an image and take a picture.

A cylinder 20 is fixed to the side wall of this CRTIO with its axis horizontal.A guide bar 24 horizontally suspended between frames 22 and 23 is fitted into the cylinder 20, and a guide bar 24 is fitted in the cylinder 20 horizontally across the frames 22 and 23.
O is supported so as to be movable in the front-rear direction (in the direction of the arrow in FIG. 1). A drive cylinder 26 is also fixed to the side wall of the CRTIO with its axis horizontal. This drive cylinder 26 has a screw hole cut into it, into which the drive shaft 28 is screwed.

The drive shaft 28 is supported by bearings 30 and 32 fixed to the frames 22 and 23, respectively.

A pulley 34 is attached to the end of the drive shaft 28 that passes through the bearing 32. On the other hand, a motor MX is fixed to the base 36, and a pulley 40 is attached to its output shaft. A belt 42 is hung between the pulley 34 and the pulley 40, and the drive shaft 28 is rotated by the rotation of the motor MX, and the CRTIO is moved in the front-rear direction (in the direction of the arrow) via the drive cylinder 26. .

The rotating shaft of the pulse generator PGX is connected to the output shaft of the motor MX, and the amount of movement of the CRTIO can be measured by detecting the number of rotations of the motor MX. In addition, the frame body 22 includes a photo limit switch LSX.
is fixed to the CRTIO to detect the reference position of the CRTIO.

The lens 14 can be moved up and down together with the shutter 44 by a device similar to the driving device of the CRTIO, and is indicated by adding Y after the corresponding part number in FIG.

However, motor MY, pulse generator PGY, and limit switch LSY correspond to motor MX, pulse generator PGX, and limit switch LSX, respectively.

Note that the bearing 30Y is fixed to a light shielding plate 46 that is integrally attached to the CRTIO.

Although not shown, a device similar to the drive device of the CRTIO described above is also provided for traveling in a direction perpendicular to the plane of the first drawing.

The upper end 46A of the light shielding plate 46 is a film l8. 45 to the side
It is bent a lot, and a mirror 16 is attached to it. A bracket 50 is attached to the tip of the light shielding plate 46,
A light shielding bellows 52 is attached between the peripheral edge of the opening 51 of the frame 22 and the bracket 50.

There is an unused film 18 on the top of the CRT image capturing device A.
A supply magazine 54 loaded with film 18 is attached, and the back side of the film 18 is sucked by a negative pressure suction device 56, and is held between a drive roller 58 and a press roller 60, and the suction is released to drive the drive roller 58. Then, the film 18 moves by its own weight toward the drive roller 58, and the drive roller and press roller sets 58, 63, 64, 66, 68, 70. They are successively held between 72 and 74 and conveyed to the exposure position. Note that the drive rollers 68 are provided only at both left and right ends of the film 18. At the exposure position, both left and right ends of the film 18 are held between holding pieces 75.

A guide 76, a drive roller 78, and a press roller 80 are provided below the exposure position.
When the shooting is completed, the drive roller 64.72.78
is driven, and the film 18 is stored in the storage magazine 82.

Next, with reference to FIG. 2, the amount of movement of the CRTIO and the lens 14 when the imaging magnification m is given will be explained. The following well-known lens imaging formula: 1/a + 1/b = 1/f...
(1) Shooting magnification (horizontal magnification) m = b / a... (2) If a and b are expressed by m and f, & (m) = (1/m + 1) f... (3 ) b (
m) = (m+ 1) f... (4) Kokote, alfc
It is the distance from the screen 12 of RTlo to the first principal point H1 of the lens 14, and b is the optical path length from the second principal point H2 of the lens 14 to the film 18. Also, f is lens 1
4, and has an error of Δf from the design value f0. Regarding the distance H between the main points, the design value HO
There is an error of ΔH from .

The optical path length L (m) from the screen 12 to the film 18 is:

L (m) = a (m) + b (m) + H - (5) m
The amount of movement X (positive on the right in FIG. 2) and y (positive on the bottom in FIG. 2) of the CRTlo and the lens 14 from the O-time photography position to the m-time photography position is expressed by equation (3).

From (4) and (5), X = L (m) −L (m o ) = (m +
1 / m - m a -1/ m o ) f ・
... (8) V=a (m) - a (no) - (1/m - 1/m) f '' (7) formula (
As is clear from 6), since X is determined by the difference in L, it does not depend on H. Therefore, if the initial position is adjusted using the mg times imaging position as the reference position, there is no need to consider the error in H. It has the advantage of

Note that the above relational expression also holds true for a combination lens.

Next, the shooting mode will be explained.

An example of the mode is shown in FIGS. 6(A) to 6(D), in which one or more images are taken on one sheet of film 18. Also, depending on the shooting mode,
As shown in FIGS. 6(E) and 6(F), images with different magnifications are taken. As shown in Figure 1, CRT
Since the main body 84 including the IO, lens l4, and mirror 16 does not move up and down, the image position in the vertical direction is determined by the driving rollers 64, 6.
8.72 to move the film 18 up and down.

Next, a control circuit for the movement amounts x and y of the CRTIO and the lens 14 will be explained with reference to FIG. Note that the movement control in the direction perpendicular to the plane of FIG. 1 (the lateral direction of the film 18) is omitted for the sake of simplicity.

The driving motor MX of the main body 84 and the lifting motor MY of the lens 14 are supplied with drive signals from an output interface 88 of the microcomputer 86.

The microcomputer 86 has a CPU90 and a ROM92.
．． RAM94. It includes an input interface 9B, the output interface 88, and a bus 98 that connects them.

The input interface 96 includes a main body 84 and a lens 14.
limit switches LSX and LSY that detect the reference position (m o times photography position), pulse generators 9PGX and PGY that detect the amount of movement of the main body 84 and the lens 14, and a design value f of the focal pressure #f. A Δf setting device lOO for setting an error from , a shooting mode setting device 102, a shooting preparation switch 104 for inputting a shooting preparation start signal, and a shooting switch 106 for inputting a shooting start signal are connected. The Δf setting device 100 and the photographing mode setting device 102 are digital setting devices.

Note that the design value fo is stored in the ROM 92, and Δf
By setting only Δf setter lOO, the number of digits of the Δf setter lOO is reduced. The photographing magnification m is determined by the photographing mode set by the photographing mode setter 102 and the exposure position of the film 18, and is determined by referring to a table stored in the ROM 92.

Next, the control flow will be explained according to the flowchart shown in FIG. 4.5. Note that, for example, (step 200) is (
200).

When the power is turned on, in step 200, the RAM
Initialize 94 work areas, and 1 main body 8
4 and the lens 14 to the reference position, that is, the mO times photography position, and the movement amount counters X and Y are cleared. Hold the shooting preparation switch lO4 turned on (202
), the film 18 is taken out from the supply magazine 54 and conveyed to the exposure position (204), and then the photographing mode setting device 1
Read the shooting mode from 02 (206). From this shooting mode, refer to the table in the ROM 92 and set the shooting magnification m.
Determine the main body 84. The lens 14 and film 18 are moved to prepare for shooting (208). Details of the movement of the main body 84 and lens 14 are shown in FIG.
This will be explained later.

Waiting for the shooting switch 106 to be turned on (210)
, the shutter 44 is opened for a time (1+m)" tl/4 and exposed (21'2), where t is the same magnification position (
This is the exposure time at position m=1).

If the shooting of one film 18 has not been completed, the process returns to step 208, and if the shooting has been completed, the film 18 is stored in the storage magazine 82 (steps 214, 2
16).

Next, the movement of the main body 84 and the lens 14, which is a part of step 208, will be explained. Here, the previous imaging magnification is m 2 and the current imaging magnification is m 2 .

Regarding the movement of the main body 84, from equation (6), m+l/m
> m +1/m, move the main body 84 backward (
direction) spaced from the film 18) (300, 302
), if m +1/m <1/m, the main body 84 is moved forward (in the direction toward the film 18) (300.
304).

Regarding the movement of Lensue 4, from equation (7), m >
If m 2 , the lens 14 is lowered (in the direction of CRTlo) (306, 308), and if m 2 <m, the lens 14 is raised (306° 310).

The outputs in steps 302, 304, 308, and 310 are hold outputs, and the pulses input from the pulse generators PGX and PGY are counted as the main body 84 moves, and when the main body 84 arrives at the target position (m times photography position). If the lens 14 has reached the target position, the movement of the lens 14 is stopped (316, 318), and the main body 84 and the lens 14 have reached the target position. If so (320), the process returns to the main routine.

Note that instead of providing the Δf setter 100, the actual f
By providing an f value setting device for inputting a value and further providing a setting device for the magnification m at the reference position (the position where limit switches LSX and LSY are turned on), it is possible to replace the lens 14 with a different focal length. It may also be used as a configuration.

[Effects of the Invention] The CRT image capturing device according to the present invention is configured such that a lens is disposed on the optical axis of the CRT, and the light transmitted through the lens is bent by 90 degrees with a mirror to form an image on the film. Therefore, it is possible to reduce the installation area of the device.

Also, if the initial adjustment is made using the mOx shooting position as the reference position, the amount of movement of the main body when shooting at mx is the current position.
From the 1x shooting position, it is (m+l/m-ml-1/m1)f, and the lens movement amount is (1/m-1) from the m□x shooting position.
/mt) f, and by correcting only the error in the focal length of the lens using the f-number input means, all photographic magnifications m can be made accurate. This has an excellent effect in that there is no need to make corrections based on errors in the mounting position, etc.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a CRT image capturing device according to the present invention, FIG. 2 is a diagram illustrating the amount of movement of the main body and lens,
FIG. 3 is a control circuit diagram of the apparatus shown in FIG. 1, FIGS. 4 and 5 are flowcharts showing the control flow, and FIG. 6 is an explanatory diagram of the photographing mode. A...CRT image capturing device, 1011.-CRT, 14.@ψ lens. 16...Mirror. 18- Φ film, MX, MY... motor. PGX, PGY-- Pulse generator, LSX,
LSY--Limit switch, 86--Microcomputer. 100... Δf setting device, 102... Shooting mode setting device.

Claims (2)

[Claims] (1) A CRT, a lens with a focal length f arranged on the optical axis of the CRT, a mirror that bends the light transmitted through the lens by 90 degrees and forms an image on the film, and moves the lens in the direction of the optical axis. A lens moving means, a body moving means for integrally moving the CRT, the lens and the mirror in a direction orthogonal to the film surface, a movement amount control means for controlling the amount of movement of the lens moving means and the body moving means, and a movement amount control means for controlling the movement of the main body and the lens. and a reference position detection means for detecting a reference position, and the movement amount control means is f.
It is equipped with a value input means and a shooting mode setting means, and the m_0x shooting position is the reference position, and in the case of m_x shooting, the amount of movement of the main body is changed from the current position m_1x shooting position to (m+1/m-m_
1-1/m_1)f, and the lens movement amount is set to (1/m-1/m_1)f from the m_1 times imaging position. (2) C according to claim 1 where m_0=1
RT image capturing device.