JPS6113233A - Ttl photometric adapter of photographic strobe of microscope - Google Patents

Abstract

PURPOSE:To make tentative light emission possible by stopping winding of a film while shutters of a film box and a shutter device connected to a microscope are closed and sproviding a light receiving means on the inside of a circumscribed circle of the field angle and on the outside of the field angle. CONSTITUTION:A film box 13 and a shutter box 11 are engaged with the microscope body through an adapter 3. A power supply part 2 allows a strobe light emitting part 1 to emit light, and a sample 8 is irradiated through lenses 5a, 5b, and 6a, and the transmitted light is led to an eyepiece part through a lens 9 and a mirror 10b. In case of photographing, the mirror 10b is evacuated, and the light is inputted to the shutter box 11 through a lens 10d and is inputted to a finder 11a through a beam splitter 11b, and a part of the light is inputted to a control box 12 through a photoelectric transducer omitted in the figure to control light emission of the strobe. In the adapter 3, a photometric TTL omitted in the figure is provided on the outside of the field angle and on the inside of the circumscribed circle of the field angle and sends the photometric result to the power supply part 2. When shutters omitted in the figure are closed, winding of the film is inhibited. Thus, tentative light emission is possible.

Description

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

Conventionally, auto strobes with TTL photometry (method that measures the light transmitted through the photographic lens) are known, but TTL strobes measure the light reflected from the film and control the light emission based on the integrated amount. It is common to do so. However, with this configuration, it is not possible to determine exposure by test flashing without wasting film. Therefore, with auto strobes for eye reflex cameras, the set aperture value and film sensitivity are set on a built-in slide rule to predict the exposure result by knowing the distance to the subject that can be photographed, but the reflectance of the subject In some cases, proper exposure may not always be obtained.

In a microscope, it is common to adjust the brightness with an ND filter in the illumination optical path in addition to the aperture, but as a photographic light source, for example, as shown in Japanese Patent Application Laid-open No. 125322/1983,
When using a TTL metering type auto strobe, the brightness changes depending on the magnification of the objective lens, NA value, microscopy method, and optical system, so it is difficult to predict whether it will be within the dimmable range. It is also difficult to set up. Therefore, for microscopic photography, it is preferable to use a TTL metering type auto strobe that can perform test flashes.

(Objective of the Invention) The object of the present invention is to obtain a TTL photometry adapter capable of test emission in a strobe for photographing a microscope.

The adapter has a light receiving means disposed inside the light flux of the circumscribed circle that satisfies the field angle and outside the field angle light flux, and an opening/closing control device that opens and closes the light shielding blade of the film box. The technical point is that the opening/closing control device also includes a blocking means for blocking the transmission of the drive signal of the film winding device to the film box when the light shielding blade is closed.

(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 IC, and can be removed together with the case IC for replacement. The power supply section 2 houses a light emitting capacitor (not shown) for the strobe light tube, and is connected to the strobe light tube 1 & through the electrode of the light tube case IC.The adapter 3 is connected to the mounting section 10bK of the lens barrel 10 It is provided between the fixed shutter box 11 and film box 130.The details of the adapter 3 will be described later, but as shown in FIG. 2, the adapter 3 includes a photoelectric conversion element 3a for TTL photometry and a light emission control circuit. 14. The opening/closing pin 3b for opening/closing the light-shielding blade 13b of the film box 13 and the contact 3C for transmitting a drive signal to the drive power circuit for film winding are placed inside. It is used in place of the device's adapter ring (or mount ring, also called a camera body, used to adjust the optical path length).

The power supply unit 2 supplies driving power to the light emission control circuit 14 of the adapter 3, and also inputs various signals from the circuit 14.
Also, from the control box 12, the strobe light emitting tube 1
Input the light emission start signal of a.

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 sending a film winding signal to the film winding motor (not shown) of the film box 13 via the adapter 3 is added. The other configurations are the same as before.

That is, the control box 12 is connected to the lamp house 4.
power is supplied to the lamp 4a of the shutter box 11, and power is supplied to the drive circuit and preamplifier of the photoelectric conversion element 11d (FIG. 3) for automatic exposure control of the shutter box 11. A conversion signal is input, and a film winding signal of the film winding motor of the film box 13 is further sent to the adapter 3. The light emitted from the lamp 4a of the lamp house 4 is conjugated to the position of the strobe light emitting tube 1a by the relay lens group 1b, and is further focused on the front side of the condenser lens 6 in the condenser 6 by the lens 5a% 5b in the mirror base 5. Becomes conjugate to position. 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 the movable reflecting mirror a G, b-,'l17 in the lens barrel lO.
After gf%-1, it is guided to the eyepiece section 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 passes through the relay lens 10d to the shutter box 11.
enter inside. The shutter box 11 has 11 beam splitters, and as shown in FIG. 3, the reflected light is guided to the finder lla, and the transmitted light is reflected by the reflecting mirror 11C and enters the photoelectric conversion element lid. A photoelectric conversion signal from the photoelectric conversion element lid is input to the control box 12 through a preamplifier (not shown). The beam splitter llb and the reflecting mirror 11c are held together by a holding plate (not shown), and this holding plate moves in an arc due to the rotation of the motor, so that the beam splitter 11b and the reflecting mirror 11c are removed from the optical path. has been done. A shutter lie is arranged above the reflecting mirror 11c.
The opening and closing of this shutter lie is also controlled by control signals from the control box 12. shutter box 1
1 is further provided with, for example, an X contact which outputs a signal when the shutter 11 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 emitting tube 1a.

Seagull box 11 has a maun)M, :'fL box side)
, the adapter 3 is connected via the mount M4 <adapter side). Inside the adapter 3, a photoelectric conversion element 3a for TTL photometry is located in the optical path at a position where the rectangular photographing angle of view is not eclipsed, that is, inside the light flux of the circumscribed circle that fills the angle of view, as shown in Fig. 3. Moreover, 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 14 inputs an appropriate exposure signal and the like to the power supply section 2.

The rotating part 3e in the adapter 3 is configured to rotate around the optical axis with respect to the outer frame, and the rotating lever 3g, one end of which is fixed to the rotating part 3e, has a groove length formed in the circumferential direction of the outer frame 9. It protrudes from the outer frame so that it can be rotated through the through hole.

A groove is formed in the lower surface of the rotating portion 3e in the radial direction, and a pin 3f urged 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 part 3e for transmitting the drive signal of the film winding motor, and also for opening and closing the light-shielding blade of the film box 13. pin 3
b is provided integrally.

A film box 13 is fixed to the adapter 3 via a mount similar to that used in single-lens reflex cameras, 3" T (on the adapter side), and 13a (on the film box side). 1
3 is rotated around the optical axis and attached, the light-shielding blade opening/closing pin 13c comes into contact with the opening/closing pin 3b of the adapter 3,
As the film box 13 rotates, the light shielding blade opening/closing pin 13c rotates with respect to the main body of the film box 13, and the pin 13c is prevented from rotating by coming into contact with the pin 3bK)2. A light shielding blade opening/closing cam 13d integrated with the pin 13c rotates. As the cam 13d rotates, the light shielding blade 13b connected to the cam 13d in a pin-groove manner opens against the biasing force of the continuous light 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 second
In the state shown in the figure, 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, push down the lever 3d and press down on the pin 3.
When f is released 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 moves in a direction to disengage from the transparent blade opening/closing bin 13c, and the film winding contact 3C and film winding circuit contact 13
e is disconnected. The opening/closing pin 3b is the light shielding blade opening/closing pin 1
3c, the light shielding blade opening/closing blade 13f rotates the light shielding blade opening/closing cam 13d to cause the light shielding blade opening/closing pin 13c to follow the movement of the opening/closing pin 3b. As a result, when the rotary lever 3g is rotated by a predetermined amount, the light shielding blade opening/closing cam 13d rotates until the light shielding blade 13b 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, the state shown in FIG. 2 is obtained.
The shading feather $13b moves in the opposite direction to what has been described so far.
becomes open.

FIG. 5 is a block diagram of a TTL side light type auto strobe capable of performing a test flash in the above embodiment.

The light emission control circuit 14 of the adapter 3 is supplied with power from the power supply 2, receives a reference voltage depending on the film sensitivity and a shutter open signal from the control box 12, and receives a photoelectric conversion signal from the photoelectric conversion element 3&. The light emission control circuit 14 has at least an integration circuit, a comparison circuit, and an initialization circuit that returns the integration circuit to its initial state, and the integration of the integration circuit that integrates the photoelectric conversion signal is started by the shutter open signal of the control box 12. 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), smaller (underexposure signal), or equal ( outputs each signal (appropriate exposure signal). 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 variable resistor whose resistance value changes depending on the film sensitivity is provided in the light emission control circuit 14 in series with the capacitor, and the integral 8 time constant of the capacitor is changed according to the setting of the film sensitivity, and the charging voltage of this capacitor is set to the appropriate exposure amount. The comparison circuit may be used to compare the voltage with a constant reference voltage corresponding to the voltage.

The power supply device 2 causes the strobe light emitting tube 1a to emit light when a shutter fully 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.

That is, the power supply device 2 inputs a charging completion signal to the display device 16 when the voltage of the light emitting capacitor reaches a predetermined voltage.
The completion of charging is displayed on the display device 16. 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 115, and if an overexposure signal is output, overexposure is displayed, and an underexposure signal is output. If is output, an underexposure signal is 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 4-bore as shown in Figure 5 is an auto-strobe used in single-lens and 7-lens cameras, etc.)
A well-known configuration of a-bo can be used.

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

Please note that the circuit connections etc. A can be modified in various ways; for example, the shutter fully open signal can be changed to shutter box 1.
1, but after the control box 12 gives a signal to open the shutter.

The shutter open signal may be output to the power source 2 after a sufficient time for the shutter to fully open.

With this structure, when emitting test light, push down the lever 3d to rotate the rotary lever 3g, close the light shielding blade 13b, and close the film winding circuit contact 13.
・Disconnect contact 3C of adapter 3. After that, specify time exposure in the control box 12, remove the beam splitter 11b and reflector lie from the optical path, open the shutter 11e, and turn on the power source 20 light emitting switch 2a. It emits light inside. At this time, if the integrated voltage is within a controllable range, the exposure exposure is 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 display cannot be obtained during the test flash, remove the lens with a neutral density filter, switch to a lens with a different brightness, etc. until the correct exposure display is obtained.
All you have to do is take some means to change the film sensitivity.

Further, even if a test light emission is performed, the film in the film box 13 will not be wound up. After emitting test light in this way, rotate the rotary lever 3g in the opposite direction and turn the pin 3. f
When it 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 contact 3C of the adapter 3 are connected.

If the light is within the dimming range, turn on the release switch (not shown) in the control box 12, and after the beam splitter 11b and reflector lio are removed from the optical path, the shutter lie opens, and when the shutter lie is fully open, the power supply 2 is turned on. Shutter open signal is input, strobe light tube 1m
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 stops emitting light. When the proper exposure signal is output from the light emission control circuit 14, the proper exposure signal is displayed on the display device 16. After a predetermined period of time, the control box 12 inputs a film winding motor drive signal to the adapter 3. This film winding signal is sent to the contact 3c of the adapter 3.
Film winding circuit contact 13 of s film box 13
The signal is inputted to the drive circuit of the film winding motor (not shown) of the film box 13 through . Then, the film can be used for unwinding photography, and TTL photometry becomes possible. Therefore, the full performance of the strobe can be demonstrated even with microscopy methods for dark specimens, and since there are sensors on the die and left in the imaging optical path, it is much easier to measure the amount of light divided by a beam splitter. It becomes possible to accurately sidelight.

＠The film was exposed unnecessarily, and the film was not wound up.You can check whether the exposure is appropriate or not by using a test flash. Therefore, an ND filter can be easily selected without taking into consideration the magnification of the objective lens, the NA-1 microscopy method, the difference in optical system, etc., and no skill is required to use it.

It is possible to commercialize a product with a structure that is compatible with the ring located between the f1 shutter box and the film box (referred to as the adapter ring, mount ring, and camera body ate). Therefore, it is not necessary to modify the parts that are pre-assembled into the photographic equipment, mirror base, or lens barrel. As long as the photographic device has a shutter and an X contact point, it can be purchased as an additional 7 accessories to the conventional device.

(b) Due to the above advantages, when attached to a manual photographic device without a photometry function, it becomes possible to take stable color photographs using a strobe in the TTL mode.

(Effects of the Invention) As described above, according to the present invention, it is possible to obtain a TTL photometry adapter for a photography strobe capable of performing test light emission. Since this product is in the form of an adapter, it can be used with existing eye microscopes without making any changes.

[Brief explanation of the drawing]

Figure 1 is a system configuration diagram of a microscope using the adapter of the present invention, and Figure 2 is an embodiment of the adapter of the present invention.
Note: Figure 3 is a bottom view of the rotating part in Figure 2 to explain the position of the photoelectric conversion element for photometry of the four-stroke light; Figure 4 is a plan view of the adapter in Figure 2. , FIG. 5 is an electrical block diagram related to strobe photography. (Explanation of symbols of main parts) 3...Adapter, M; tai・-mount, 3a・
...Photoelectric conversion element, 3b...Shading blade opening/closing bottle, 3c
...Circuit contact for film winding, 3d...Lever, 3
... Rotating part, 3f... Fitting pin, 3g... Rotating lever, 3 h-... Spring.

Claims (1)

[Scope of Claims] A first mount that engages with a shutter box, a second mount that engages with a film box, an opening/closing control device that opens and closes a light shielding blade of the film box, and a film winding of the film box. a signal transmission contact that contacts the contact of the film box in order to transmit a drive signal from the control box to the upper device; A strobe for photographing a microscope, comprising: a blocking means for blocking the transmission of the drive signal to the film box; and a light receiving means disposed inside a light flux of a circumscribed circle that fills the field angle and outside the field angle light flux. TTL metering adapter.