JPH0542652B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a strobe photographing device for a microscope.

Traditionally, TTL side-light type auto strobes (methods that measure the light transmitted through the photographic lens) are known, but these auto strobes measure the light reflected from the film and control the light emission based on the integrated amount. Things are common. However, with this configuration, exposure cannot be determined by test flashing without wasting film. Therefore, with auto strobes for single-lens reflex cameras, the set aperture value and film sensitivity are matched with the built-in slide rule, and the distance to the subject that can be photographed is known to predict the exposure result. In some cases, proper exposure may not always be obtained.

In microscopes, brightness is generally adjusted using an ND filter in the illumination optical path instead of an aperture.
When using a TTL metering type auto strobe as shown in JP-A No. 52-125322, for example, as a photographing light source, there are differences in the magnification of the objective lens, NA value, microscopy method, optical system, etc. Since the brightness also changes, it is even more difficult to predict whether the brightness will be within the dimmable range. Therefore, for microscopic photography, it is preferable to use a TTL metering type auto strobe that can perform test flashes.

(Objective of the Invention) An object of the present invention is to obtain a strobe photography device for a microscope that is capable of performing TTL photometry using the same light receiving element during test emission in a strobe for photographing a microscope.

(Summary of the Invention) In each of the test light emission mode and the main light emission mode, a light beam that forms an image of the specimen other than a part of the image of the specimen formed on the film, that is, a light beam that forms the remainder of the image of the specimen. The technical point is to have a light receiving means for receiving light.

(Embodiment) FIG. 1 is a schematic diagram of a microscope photographing device having an adapter according to an embodiment of the present invention.

A light emitting unit 1 of a strobe device (electronic flash device) is constructed by arranging a strobe light emitting tube 1a and a relay lens group 1b on an illumination optical axis. The strobe light emitting tube 1a is housed in a case 1c, and the entire case 1c can be removed for replacement. The power source section 2 houses a light emitting capacitor (not shown) for the strobe light emitting tube, and is connected to the strobe light emitting tube 1a via an electrode of the light emitting tube case 1c. The adapter 3 is provided between a shutter box 11 and a film box 13, which are fixed to the straight tube of the lens barrel 10. Details about Adapter 3 will be described later, but
As shown in FIG. 2, the adapter 3 is driven by a photoelectric conversion element 3a for TTL photometry, a light emission control circuit 14, an opening/closing pin 3b for opening and closing the light shielding blade 13b of the film box 13, and a drive power supply circuit for film winding. It has a built-in contact point 3c for transmitting signals, and can be used in place of the conventionally used adapter ring (or mount ring, also called a camera barrel, for adjusting the optical path length) for microscopic photography. .

The power supply section 2 supplies driving power to the light emission control circuit 14 of the adapter 3, inputs various signals from the circuit 14, and also inputs various signals from the control box 12.
A light emission start signal for the strobe light emitting tube 1a is input from. Further, the power supply section 2 has a light emission switch 2a for test light emission, and is connected to a display device 16 that displays whether dimming is possible or not.

The only difference is that the control box 12 outputs a light emission start signal to the power supply section 2, and the function of transmitting a film winding signal to the film winding motor (not shown) of the film box 13 via an adapter 3 is added. The other configurations are the same as before.
That is, the control box 12 supplies power to the drive circuit, preamplifier, etc. of the photoelectric conversion element 11d (FIG. 2) for automatic exposure control of the shutter box 11, and also inputs a photoelectric conversion signal from the photoelectric conversion element 11d. Furthermore, a film winding signal from the winding motor of the film box 13 is sent to the adapter 3. Lamp 4 in Lamp House 4
The light emitted from a is conjugated to the strobe light emitting tube 1a by the Lee lens group 1b, and is further conjugated to the front focal point of the condenser lens 6a in the condenser 6 by lenses 5a and 5b in the mirror base 5. . The light emitted from the condenser lens 6a passes through the specimen 8 on the stage 7 and enters the objective lens 9. The light from the objective lens 9 is reflected by a movable reflecting mirror 10b within the lens barrel 10, and then guided to the eyepiece 10a. When photographing, the movable reflecting mirror 10b is moved in the direction of the arrow to cause the light from the objective lens 9 to travel straight. The image by the objective lens 9 is the relay lens 1
The light enters the shutter box 11 through 0d. The shutter box 11 has a beam splitter 11b, and as shown in FIG. 2, reflected light is guided to a finder 11a, and transmitted light is reflected by a reflecting mirror 11c and enters a photoelectric conversion element 11d. A photoelectric conversion signal from the photoelectric conversion element 11d is input to the control box 12 through a preamplifier (not shown). Beam splitter 11b and reflector 1
1c is held together by a holding plate (not shown),
This holding plate moves in an arc due to the rotation of the motor,
Thereby, the beam splitter 11b and the reflector 1
1c is configured so that it exits the optical path. A shutter 11e is arranged above the reflecting mirror 11c, and opening and closing of the shutter 11e is also controlled by control signals from the control box 12. The shutter box 11 is further provided with, for example, an X contact which outputs a signal when the shutter 11e is fully opened, and an on signal from this contact is input to the control box 12 as a light emission start signal for the strobe light bulb 1a.

Shutter box 11 has mount M ₁ (shutter box side) and mount M ₂ (adapter side).
Adapter 3 is connected via. Inside the adapter 3, a photoelectric conversion element 3a for TTL photometry is located in the optical path at a position where there is no vignetting of the rectangular shooting angle of view, that is, inside the luminous flux of the circumscribed circle that fills the angle of view, as shown in Figure 3. , and is disposed outside the viewing angle light flux, and the photoelectric conversion signal from the photoelectric conversion element 3a is input to the light emission control circuit 14, and the light emission control circuit 1
Reference numeral 4 inputs appropriate exposure signals and the like to the power supply unit 2.

The rotating part 3e in the adapter 3 is configured to rotate around the optical axis with respect to the outer frame.
A rotary lever 3g having one end fixed to e is rotatably protruded from the outer frame through a longitudinal through hole formed in the circumferential direction of the outer frame. A groove is formed in the radial direction on the lower surface of the rotating portion 3e, and a pin 3f biased upward from the outer frame by a spring 3h is fitted into this groove. A lever 3d is fixed to the pin 3f, and this lever 3d protrudes so as to be operable from a long hole formed in the vertical direction in the outer frame. As can be seen from the plan view in FIG. 4, two electrical contacts 3c are formed on the upper surface of the rotating portion 3e for transmitting drive signals for the film winding motor, and also for opening and closing the light-shielding blade of the film box 13. A pin 3b is integrally provided.

Mount similar to that used in single-lens reflex cameras, 3i (adapter side), 13a
The film box 13, which is fixedly attached to the adapter 3 via the film box side (on the film box side), is attached to the opening/closing pin 3b of the adapter 3 when the film box 13 is rotated about the optical axis and attached to the adapter 3.
The light shielding blade opening/closing pin 13c comes into contact with the film box 1, and as the film box 13 rotates, the film box 1
The light shielding blade opening/closing pin 13c rotates with respect to the main body of the light shielding blade 3 (the pin 13c is prevented from rotating by coming into contact with the pin 3b), and the light shielding blade opening/closing cam 13d integrated with the pin 13c rotates. The light-shielding blade 1 is connected to the cam 13d in one pin groove by the rotation of the cam 13d.
3b operates to open against the biasing force of the light-shielding blade opening/closing spring 13f, which always biases the blade 13b in the closing direction. When the film box 13 is completely attached to the adapter 3, the state shown in FIG. 2 is reached, and the film winding circuit contact 13e of the film box 13 is connected to the contact 3c of the adapter 3. .

In the state shown in FIG. 2, when the lever 3d is pushed down to remove the pin 3f from the groove of the rotating part 3e and the rotating part 3e is rotated by the rotating lever 3g, the opening/closing pin 3b stops engaging with the light shielding blade opening/closing pin 13c. At the same time, the film winding contact 3c and the film winding circuit contact 13e are disconnected from each other. Even if the opening/closing pin 3b tries to escape from the shading blade opening/closing pin 13c, the shading blade opening/closing blade 13f rotates the shading blade opening/closing cam 13d and the opening/closing pin 3
The light-shielding blade opening/closing pin 13c follows the movement of b. As a result, when the rotary lever 3g is rotated by a predetermined amount, the light shielding blade opening/closing cam 13d opens the light shielding blade 13b.
Rotate until it is completely closed. If the rotating lever 3g is rotated in the opposite direction so that the pin 3f fits into the groove of the rotating part 3e again, and the state shown in FIG. It becomes open.

Figure 5 shows how test light emission can be performed in the above example.
This is a block diagram of a TTL metering auto strobe.

Power is supplied from the power supply device 2 to the light emission control circuit 14 of the adapter 3, and the control box 12
A reference voltage and a shutter open signal depending on the film sensitivity are inputted from the photoelectric conversion element 3a, and a photoelectric conversion signal is inputted from the photoelectric conversion element 3a. The light emission control circuit 14 includes at least an integration circuit, a comparison circuit, and an initialization circuit for returning the integration circuit to its initial state. This integrated voltage is compared with a reference voltage corresponding to the appropriate exposure amount by a comparison circuit, and the comparison circuit determines whether the integrated voltage is larger than the reference voltage (overexposure signal) or smaller (underexposure signal). Each signal indicating whether the exposure is equal (appropriate exposure signal) is output. After a predetermined period of time after the shutter open signal is input (slightly longer than the longest time obtained in advance for use in strobe photography), an initialization circuit comprising a timer or the like brings the integral voltage to zero in the integrating circuit. Note that the reference voltage changes in accordance with the film sensitivity specified in the control box 12 so as to provide an appropriate exposure amount. A light emission control circuit 14 is provided in which a variable resistor whose resistance value changes depending on the film sensitivity is connected in series with the capacitor.
The integration time constant of the capacitor may be changed in accordance with the setting of the film sensitivity, and the charging voltage of the capacitor may be compared with a constant reference voltage corresponding to the appropriate exposure amount using a comparison circuit.

The power supply device 2 causes the strobe light emitting tube 1a to emit light when a shutter full-open signal from the control box 12 is inputted via the light emission control circuit 14. When a proper exposure signal or an overexposure signal is input from the light emission control circuit 14, the power supply to the strobe light emitting tube 1a is cut off.

A display device 16 is connected to the power supply device 2 and displays whether charging is complete, proper exposure, overexposure, or underexposure. In other words, the power supply device 2 sends a charge completion signal to the display device 1 when the voltage of the light emitting capacitor reaches a predetermined voltage.
6 to display charging completion on the display device 16. Further, after the exposure is completed, if a proper exposure signal is output from the light emission control circuit 14, proper exposure is displayed on the display device 16, and if an overexposure signal is output, overexposure is displayed, and an underexposure signal is output. If so, underexposure will be displayed. The display device 16 may be integrated with the power supply 2, the adapter 3, the control box 12, or stand alone.

As described above in detail, the circuit itself of the auto strobe shown in FIG. 5 can be of a well-known configuration of an auto strobe used in a single-lens reflex camera or the like.

The circuit configuration for automatic exposure without the use of a strobe, etc. is completely the same as the conventional one, and is not directly related to the present invention, so a description thereof will be omitted.

Note that various modifications can be made to the circuit connections, etc. For example, the shutter full-open signal is not obtained from the shutter box 11, but is required for the shutter to fully open after the control box 12 issues a signal to open the shutter. The shutter open signal may be output to the power supply 2 after a sufficient period of time.

With this structure, when emitting test light, push down the lever 3d to rotate the rotary rare 3g, close the light shielding blade 13b, and close the film winding circuit contact 13e and the contact 3 of the adapter 3.
Disconnect c. After that, specify time exposure in the control box 12 and set the beam splitter 1.
1b, the reflector 11c is removed from the optical path, the shutter 11e is opened, and the light emitting switch 2a of the power source 2 is turned on, so that the strobe light emitting tube 1a emits light within a dimmable range. At this time, if the integrated voltage is within a controllable range, the appropriate exposure will be displayed. If the integrated voltage does not reach the reference voltage after the light emission ends, underexposure is indicated, and if the integrated voltage is greater than the reference voltage, overexposure is indicated. Therefore, if the correct exposure cannot be obtained during a test flash, it is necessary to add or remove a neutral density filter, switch to a lens with a different brightness, or change the film sensitivity until the correct exposure is obtained. All you have to do is take the following measures. Further, even when a test light emission is performed, the film in the film box 13 does not wind up. After emitting test light in this way, if the rotating lever 3g is rotated in the opposite direction and the pin 3f is inserted into the groove of the rotating part 3e, the light shielding blade 13b opens and the film winding circuit contact 13e and the adapter are connected. 3 contacts are connected.

If the light is within the dimming range, control box 1
When the release switch 2 (not shown) is turned on, the shutter 11e opens after the beam splitter 11b and the reflector 11e are removed from the optical path. When the shutter 11e is fully opened, a shutter open signal is input to the power supply 2, and the strobe light is emitted. The tube 1a emits light.
When the amount of light emission becomes equal to the proper exposure amount, the light emission control circuit 14 outputs a proper exposure signal and the strobe light emitting tube 1a stops emitting light. When the proper exposure signal is output from the light emission control circuit 14, the proper exposure is displayed on the display device 16. control box 12
After a predetermined time, a film winding motor drive signal is input to the adapter 3. This film winding signal is inputted to a drive circuit of a film winding motor (not shown) of the film box 13 through a contact 3c of the adapter 3 and a film winding circuit contact 13e of the film box 13. The film is then wound and returned to its initial state.

In the embodiments of the present invention described above, (a) 100% of the photographing light can be used for photographing, and TTL photometry is also possible. Therefore, the full performance of the strobe can be demonstrated even with microscopy methods for dark specimens, and since the sensor is located directly in the imaging optical path, it is much easier and more accurate than measuring the amount of light divided by a beam splitter. It becomes possible to measure light.

(b) The suitability of exposure can be confirmed by test flashing without needlessly exposing or winding the film.
Therefore, the magnification of the objective lens, NA value, microscopy method,
You can easily select an ND filter without considering differences in optical systems, and no skill is required to use it.

(c) It is possible to commercialize a product with a structure that is compatible with the ring located between the shutter box and film box (referred to as an adapter ring, mount ring, camera body, etc.). Therefore, without having to incorporate or improve the photographic device, mirror base, or lens barrel in advance, as long as the photographic device has a shutter and an X contact, it can be purchased as an additional accessory to the conventional device.

(d) Due to the above advantages, if it is installed on a manual photographic device without a photometry function, it will be possible to use a strobe.
It is now possible to take stable color photos using the TTL metering method.

(Effects of the Invention) As described above, according to the present invention, photometry can be performed in the test emission mode using the same light receiving means as in the main emission mode, so the configuration is simple and the luminous flux to be measured is , as well as the light flux that forms the image of a part of the specimen formed on the film, the light flux that passes through the objective lens forms the rest of the image of the specimen, so it forms the image of the specimen formed on the film. The light flux including the image of the specimen can be photometered without reducing the light flux.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a microscope using the adapter of the present invention, FIG. 2 is an explanatory diagram of an embodiment of the adapter of the present invention, and FIG.
FIG. 4 is a plan view of the adapter shown in FIG. 2, and FIG. 5 is an electrical block diagram related to strobe photography. . (Explanation of symbols of main parts), 3...Adapter,
M ₂ , 3i...Mount, 3a...Photoelectric conversion element,
3b...Shading blade opening/closing pin, 3c...Film winding circuit contact, 3d...Lever, 3e...Rotating part, 3f...Fitting pin, 3g...Rotating lever, 3
h...Spring.

Claims (1)

[Claims] 1. A test light emission mode for experimentally illuminating a specimen;
a strobe light emitting device having a main light emission mode for illuminating the specimen for film exposure; a microscope objective lens and a photographing lens that form an image of the illuminated specimen; and a portion of the image of the specimen on the film. a film box for holding the film so that the film is formed in the test light emission mode; a light-shielding means for interrupting the shielding of the light-shielding means, and a light-receiving means disposed closer to the objective lens than the light-shielding means, and receiving a light beam forming the remainder of the image of the specimen in each of the test light emission mode and the main light emission mode. A strobe photographing device for a microscope, comprising: a control means for controlling the strobe light emitting device based on the output of the light receiving means.