JPS6052411B2 - Electronic flash device ignition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition device for igniting an electronic flash device using an exposure control system incorporating a flash bulb ignition circuit configured to ignite a flash bulb.

More specifically, the flashlight bulb ignition circuit includes monitoring means for monitoring whether the flashlight bulb is reliably ignited, and the exposure control system adapts to flash photography based on an output signal of the monitoring means. and wherein when an electronic flashing device is used in place of the flashing bulb and the electronic flashing device is ignited, the monitoring means generates an output signal similar to that in igniting a flashing bulb. This provides an ignition device for an electronic flash device in which the exposure control system is configured to perform exposure control adapted to flash photography. The monitoring means performs its monitoring function using an ignition current based on a specific impedance of the flashing bulb, and when an electronic flashing device is used, the ignition device of the present invention has an impedance characteristic corresponding to the specific impedance as an adapter. is added.

Further, the control circuit of a camera having a flash ignition circuit, which is equipped with a switching device that ignites the electronic flash device in response to the operation of a switching element of the flash ignition circuit, is configured to avoid noise generated by the ignition of the electronic flash device. If the device is sensitive to signals or the like, the switching itself can be performed in a state where it is electrically isolated from the switching operation of the flash ignition circuit. In one embodiment, the present invention utilizes an electromagnetic actuator to ignite an electronic flash device in response to synchronous operation of a flash ignition circuit. The necessary signal output conditions of the flash ignition circuit are maintained by using the impedance selected as described above in conjunction with the electromagnetic actuator. The use of this impedance in the circuit also allows the switching elements of the flash bulb's ignition circuit to conduct the appropriate amount of current and conduction for the required energization time. One device of the invention combines the windings of an electromagnetic drive with a tie-out device to eliminate any interference caused by the inductive components of the windings and the camera control circuit.

In another device of the present invention, a relay is utilized as the electromagnetic drive device. The contacts of this relay, which operate as a switch, are parallel-connected solid-state contacts that conduct at approximately the same time as the relay closes, which activates the electronic flashing device.
Protected using a switching device. Another feature and object of the invention is to provide an adapter device for use with an exposure control device for a photographic device having an ignition circuit with a switching network connected through an output terminal to a flashing bulb.

Such a flashing bulb exhibits a predetermined impedance value when ignited, and the switching circuitry is operative to cause the flashing bulb to be ignited by the pulsed source. A monitoring device is combined with a circuit including a current sensing device responsive to the exhibited impedance value of the flashing bulb to obtain selected output conditions for use in control. The adapter includes a device that can be connected to an output terminal that powers another illumination source, such as an electronic flashing device.
A switch device is provided which is actuated to activate the other illumination source, which switch is further actuated by an electromagnetic device which can be represented in the form of a relay. Furthermore, an impedance is provided by the electromagnetic element of the relay, which impedance is selected to have a value corresponding to the impedance value of the flashing bulb used by the monitoring function of the ignition circuit. Preferably, this impedance is obtained from a resistor connected in parallel with the winding or electromagnetic part of the relay. To protect the contacts of the switch device of the electronic flashing device, electronic switches such as gated thyristor devices can be connected in parallel and gated in response to the closure of the switch contacts. Such devices serve to prevent excessive deterioration of the contacts. Other objects of the invention are in part obvious and in part explained below.

Accordingly, the present invention is directed to a device having the structure, combination of elements, and arrangement of parts as exemplified in the detailed description that follows.

BRIEF DESCRIPTION OF THE DRAWINGS The features and objects of the invention will become apparent from the detailed description given below with reference to the accompanying drawings. The invention is particularly suited for use with highly automated camera control systems.

The camera is made to operate in both flash and natural lighting modes, and the exposure adjustments are different for each such mode. FIG. 1 shows a block diagram illustrating the basic features of these two mode adjustments.

The following explanation assumes the case of a single-lens reflex self-developing camera such as the "SX-70 Land Camera (product name)," so before explaining the operation of the block diagram, we will first explain the basic configuration of this camera. Explain. However, it goes without saying that the present invention should not be limited to those used in cameras such as those described above. Now, in a single-lens reflex self-developing camera, the optical path (exposure aperture) of the shutter blade is open in order to observe the field of view before the start of the photographing cycle, and the field image that enters through the exposure aperture is passed through a reflector. It is directed toward an observation window, and the user observes the field of view to be photographed through the observation window and adjusts the focus.

On the other hand, the above-mentioned reflector serves to shield the photosensitive surface of the film unit inside the camera, and prevents the field image rays from entering the film unit while observing the field image and adjusting the focus. . Next, when the shutter button is pressed, the shutter blade is first driven to close the exposure aperture. The reflecting mirror is then driven to move from a position where it shields the photosensitive surface of the film unit to a non-shielding position. In this unshielded position, the reflecting mirror has the function of reflecting the field image incident from the exposed aperture of the shutter blade and directing it toward the photosensitive surface of the film unit. In this way,
At the beginning of the photographing cycle, while the exposure aperture of the shutter blade is closed, the camera is changed from the field observation position to the exposure position. When the exposure position is changed, the shutter blade automatically starts moving from the position where the exposure aperture is closed to the position where it is opened, and the film unit surface is exposed. In the flash illumination mode, flash ignition is performed during this time, and when the necessary amount of exposure is given, the shutter blade returns to the closed position again, and the reflector returns to the film position.
The unit is moved to a position where it is shielded, and then the shutter blades are driven to the open position and the camera assumes its original viewing position. The above operations are controlled by a circuit as shown in the block diagram of FIG. First, the case of natural lighting mode will be explained based on FIG. First, by operating a shutter button (not shown), the cycle control device 14
6, two signals are generated simultaneously through line 18 and provided to inhibit device 20 and electromagnetic drive device 12. This energizes the solenoid of the electromagnetic drive device 12. Exposure mechanism 10, including electromagnetic drive 12 and shutter blades, is mechanically coupled as shown by line 11 so that energization of the solenoid causes one shutter blade of mechanism 10 to block the optical path of the camera. Please close it. On the other hand, when inhibiting device 20 receives signal 18, it controls the photosensitive control circuit via line 24 and temporarily disables the circuit from activation. Next, although not shown, the above-mentioned reflecting mirror is moved to convert the camera from the visual field observation position to the exposure position. The cycle controller 14 then converts the signal on line 18 provided to the inhibiting device 20 into a signal for activating the photosensitive control circuit 22, and also outputs the signal on line 16 to the inhibiting device 20.
The signal is also switched to deenergize the solenoid of the electromagnetic drive device 12. De-energizing the solenoid causes the exposure mechanism 10 to open the optical path of the camera. The photosensitive control circuit 22 monitors the opening of this optical path and also monitors the brightness of the scene being photographed, and when a suitable exposure value is obtained the device provides a signal along line 28 to the trigger device 26 to trigger the trigger. Device 26 drives electromagnetic drive 12 along line 30 to reenergize the solenoid so that exposure mechanism 10 quickly blocks the optical path to terminate exposure in the natural lighting mode. A signal supplied from the cycle controller through line 16 causes the electromagnetic drive unit 12 to operate until the film processing operation after exposure is performed.
The exposure mechanism 10 maintains this state of blocking the optical path. When these operations are completed, the control device 14 de-energizes the electromagnetic drive device 12, the shutter blade moves to the open position again, and the camera assumes the field observation position in preparation for the next photographing cycle. When the camera is operated in flash illumination mode, a packaged multiple flash bulb array is attached to the camera and the flash bulb array is oriented to illuminate the scene.

With such attachment, the cycle controller 14 is automatically adjusted to perform flash illumination mode exposure cycles. It is the same as in the natural lighting mode that the camera is first changed from the viewing position to the exposure position by operating the shutter button, but in the artificial lighting mode, when the exposure mechanism 10 blocks the optical path, the line 32 Along the line, cycle controller 14 generates a signal that activates focus actuator 34 . Such a focus device (one that detects distance information and controls the size of the exposure aperture based on the distance information) operates according to the illuminance from the flashing light source that is expected to reach the subject. To predict such illumination, the focus device utilizes a method based on the application of the inverse square law of light energy propagation. According to this law, the light energy obtained from a given light source is inversely proportional to the square of the distance from the light source. The subfocal method uses a method of automatically adjusting the lens aperture by combining the camera's exposure mechanism 10 and a focus adjustment device. This device uses a solenoid-type electromagnetic suction device to move the blades of the exposure mechanism 10 at a position corresponding to the subject distance when the blades of the exposure mechanism 10 are released by the drive device 12 and moved from the fully closed position to the fully open position. A member for stopping the blade is moved into the movement path of the blade. The mechanical interaction between the focus actuator device 34 and the exposure mechanism 10 is represented by the dashed line 36. A suitable delay time is provided to ensure that the blades of the exposure mechanism 10 are properly stopped and held by the focus actuator device 34.
The solenoid in the actuator is deenergized and a flash firing pulse is obtained inductively. This pulse is sent to the flash ignition circuit 40 through a suitable connection line 38.
In response to this pulse input from line 38, ignition circuit 40
is a suitable one of the camera-mounted flashing bulb array 42.
select a flashing light bulb and output terminal 44 of the circuit.
A flashing bulb is ignited through and 46 to illuminate the scene. The present invention relates to a circuit device for igniting an electronic flashing device instead of the flashing light bulb,
In either case, the point of ignition by the flash ignition pulse is the same. If the illumination of the flashing bulb is good, the illuminated bulb should exhibit a predetermined value of resistive impedance, which value is further sensed by the detection and monitoring function of the ignition circuit 40. This monitoring function then leads to a particular output signal appearing along line 48. That is, when a particular signal appearing on line 48 activates a fixed delay device 52 operated by line 50, a unique signal on line 48 causes inhibit device 2 to disable photosensitive control circuit 22.
It also works on 0. Following a predetermined time selected to correspond to the time required for the ignited flash bulb to fully illuminate, fixed delay device 52 connects trigger device 26 from line 54 to perform the function of ending exposure. send a signal.
Thereby, trigger device 26 issuing a signal from line 30 causes electromagnetic drive 12 which energizes the shutter drive solenoid described above to cause exposure mechanism 10 through mechanical linkage 11 to interrupt the optical path of the juvenile melanoma.
This optical path blocking condition is maintained until film processing and optical path state change procedures are performed. As in the case of natural lighting, the cycle controller 14 may then cause the device to pause or standby for the next photo cycle. A connection diagram of the flash ignition circuit 40 is shown in FIG.

A plurality of flashing bulbs 60a-60c are connected to terminals 62a-62c of three bulb connection lines 64a-64c, respectively. Connection lines 64a-64c of the circuit are connected in parallel between power leads or busbars 66 and 68.
Leads 66 and 68 are further connected to a current monitoring and detection device 70 and a flash bulb switching circuit 72, respectively. Current monitoring device 70 and flash bulb switching circuit 72 are energized by power supply 74 . Each bulb circuit line 64a-64c has a switching device designated SCR 76a-76c, respectively. SCR76a~76
The gate electrodes of C are connected to switching circuit 72 through lines 78a-78c, respectively. Pulse generator 8
Flash bulb switching circuit 72, operated by 0, sequentially gates a selected one of SCRs 76a-76c. When so gated, the selected SCR conducts to pass ignition current to its corresponding flashing bulb. Pulse generator 80 is considered to be the functional equivalent of the solenoid of focus actuator 34 . When a selected one of flash bulbs 60a-60c is ignited, a voltage drop will be created across resistor 82.

A resistor 82 is connected to a line 84 between lead 66 and current monitoring device 70. When such a voltage drop occurs and is detected, current monitoring device 70 detects line 4 in FIG.
A signal is sent to latch circuit 86 to create a specific signal state as shown at 8. The output of latch circuit 86 is indicated by 88 in FIG. If the flashing bulbs 62a-62c do not fire, there will be no voltage drop across the current monitor 82 and no signal will be sent to the latch circuit 86. Therefore, output 88 will not manifest the particular output signal state required. Under these circumstances, the fixed delay device 5
2 and the inhibiting device 20 of the photosensitive control circuit are not activated, and the camera continues to be in the natural lighting mode photographic cycle. Third
A more detailed diagram of current monitor 70, switching circuit 72, and latch circuit 86 is provided in the figure. In the accompanying figures, where appropriate, the same numbers have been used for parts previously described. Thus, as shown, the flashing bulbs 60a-60c are connected to the flashing circuit lines 64a-64.
c and further connected between power leads 68 and 66. Lead 66 is further connected to mains power lead 92 via line 90 . Also, the light bulb circuit line 64
Among SCRs a-64c are SCRs 76a-76c, which are further connected to sequence logic circuits 94 and 96. Sequence logic circuit 94 connects S through line 98.
The anode side of CR 76a is connected to line 64a and further coupled to the gate line 78b of SCR 76b. Similarly, logic circuit 96 connects SCR via line 100.
Bulb circuit line 64b and SC on the anode side of 76b
Connected to gate line 78c of R76c. Sequence logic circuits 94 and 96 serve, for example, to detect the previous ignition of a flashing bulb 60a, and to cause the circuit to trigger the next flashing bulb by transmitting an ignition or gate pulse to its appropriate SCR 76b. Let them choose. When the firing circuit is energized by lines 68 and 92, a short pulse of duration, for example about 10 μs, is produced from the focus actuator 34 shown in function block 102.

This pulse is passed along line 104 through a level sensing Zener diode 106 to a PNP transistor Q1.
is sent to the emitter terminal. The base electrode of transistor Q1 is connected to power supply line 92 through line 108, and its collector electrode is connected to line 110. line 1
10 is further connected through line 112 and resistor 114 to the base of NPN transistor Q2. A bypass resistor 116 is connected between ground or power supply lead 68 and line 112 and into line 118 between resistor 114 and the base of transistor Q2. The collector of transistor Q2 is connected to power supply lead 92 through line 120, and its emitter is connected to SCR 76a.
gate line 78a. In the illustrated apparatus, when a short duration pulse appears on line 104,
Transistor Q1 is biased to conduct for a correspondingly short duration, thereby causing lines 110 and 112 to
, thus forward biasing the base-emitter junction of transistor Q2. Transistor Q2 simultaneously activates line 120 from power supply lead 92 to provide a short duration gate current to gate line 78a of SCR 76a. Thus gated SCR 76a is turned "on" to ignite the filament of flash bulb 60a. SCR 76a should remain "on" until rectified off by the decay of the current in line 64a caused by the rupture of the ignition filament in flash bulb 60a. The next operation of the ignition circuit will gate SCR 76a on, but a sustaining current will be available from line 98 of sequence logic circuit 94 to maintain conduction of the SCR. Additionally, sequence logic circuit 94 will provide gate current to SCR 76b via line 78b. Therefore, during this operation of the ignition circuit, the flashing bulb 60b should be ignited. The next flash cycle will similarly activate sequence logic 96 through line 100 to ignite the last flash bulb 60c. Of course, several more flashing bulbs can be arranged in this ignition circuit. When transistor Q1 is forward biased for a short period of time resulting from the pulse on line 104,
NPN transistors are also forward biased. The base of transistor Q3 is connected to line 110 through resistor 124, its emitter is connected to lead 68 through line 126 and line 128, and its collector is connected to line 130. Line 130 is connected to power supply line 92 through resistor 132 and diode 134. When transistor Q3 is forward biased, line 30 is energized and a reference voltage is created through diode 134. This reference voltage is further applied to the diode 13
A voltage divider circuit including resistors 136 and 138 connected in line 140 between the cathode side of 4 and power supply line 192. This shaped reference voltage is provided by line 142 connected between resistors 136 and 138 and extending to the emitter terminal of PNP transistor α. The collector of transistor Q4 is connected to gate lead 144, and its base is connected to common line 1
46. The magnitude of the voltage developed on line 146 is insufficient to forward bias the base-emitter junction of transistor O. Line 146 is also connected to the base of another PNP transistor Q5, the emitter of which is connected through line 148 to one side of resistor 82 in line 90. The collector of transistor q is connected to line 130 through line 150, line 152 and resistor 154. Note that when transistor Q5 is forward biased, the voltage on line 146 changes in response to the voltage change on resistor 82. In this device some form of comparison circuitry is provided. For example, assuming that the selected flash bulb 60a-60c is successfully lit, the current flowing through sense resistor 82 will result in a voltage drop, but during the duration of the actuation pulse derived from line 104, transistor Q4 and A similar voltage drop occurs on common line 146 since q is chosen to remain conductive. The voltage drop thus created on line 146 serves to increase the bias of transistor O, so that transistor O begins to conduct, thereby activating gate line 144. Furthermore, line 144 is similar to line 12
Gates on the SCRl 56 connected in 8.
That is, gated SCRl 56 should begin conducting through resistor 158 and remain conducting until the sustained current from power lines 92 and 68 is reduced. Line 128 is also connected to line 16 from the anode side of SCR156.
0 and to the base of PNP transistor α through resistor 162. The emitter of transistor Q6 is connected to power supply line 92 through line 164, and its collector is connected to line 68 through resistor 166 and line 168. Since SCR156 continues to conduct, transistor Q6 becomes forward biased. line 16
The energized state of 8 and the voltage level appearing on that line is directed to output line 88, which further provides the specific signal conditions necessary to activate fixed delay device 52 and inhibit device 20. Selected flashing bulbs 62a-62c
If the ignition did not fire, no appreciable ignition current would flow through the sense resistor 82 and no voltage drop would occur on the common line 146.

As a result, transistor α is not forward biased and the gate
It is not added to turn on SCR156 through line 144. Since SCR156 is not conducting, transistor Q6 is not forward biased and the particular signal condition described above does not appear at output 68. As can be seen from the operation description in FIG. 3, all of the above-mentioned SCRs become conductive due to an extremely short pulse of, for example, 10 μs, supplied from the focus actuator 102, and the current value increases with respect to the short period of the above-mentioned pulse. In the meantime, it is necessary to reach the level necessary to maintain the conduction.

Such sustained current levels are easily obtained using a standard flashlight bulb with a resistive ignition filament, but are easily achieved if an inductive load is present in place of the resistive ignition filament. isn't it. If an inductive load is present, the current rise characteristic of the fired SCRs 76a-76c may be so slow that it may not be possible to cause the SCRs to conduct continuously. As a result, the selected flash bulb fails to ignite. Furthermore, because sufficient current does not flow through the sense resistor 82, transistor Q cannot be forward biased, resulting in latch SCR156.
You can't even gate it. Therefore, line 8
The required signal condition at 8 will not occur and the camera will not be able to complete the capture cycle. FIG. 4 shows an electronic flash device 178 using a flash bulb ignition circuit.
An adapter device 180 is shown for activating the like.

Although generally shown here as terminals 182 and 184,
Any of the contact terminals 62a to 62c described above may be used as a terminal for connecting this adapter device 180 to the circuit 40. Adapter 180 includes contacts 182 and 184.
Leads 186 and 188 for connecting a drive winding 190 such as a reed type relay are provided at both ends of the coil. When relay winding 190 is energized, the contacts of switch 192 are closed. Dashed line 194 indicates that winding 190 and switch 192 are electrically isolated but operatively associated.
It shows. Winding 190 presents an inductive load to the flasher bulb ignition circuit. This load will therefore, unless appropriate measures are taken, prevent the current flowing through the flasher bulb circuits 64a-64c from rising, so that the gate current in lines 78a-78c that occurs at the end of the actuation pulse disappears. Before you do
This means that the current value of the SCRs 76a to 76c cannot be increased to the sustained current level. To modify this inductive characteristic, an impedance in the form of a fixed resistor 196 is connected between lines 186 and 188 in parallel with winding 190. Furthermore, the diode 198 is connected to the winding 190
Similarly connected in parallel with. In the illustrated device, when a simple ignition signal energizes contacts 182 and 184, winding 19
0 begins to be biased to close switch 192.
To ensure proper operation of flasher ignition circuit 40, resistor 196 is selected to have the same impedance characteristics as the flasher bulbs 60a-60c. Thus, circuit 40 confirms successful ignition of the flashing bulb, transistor α conducts, and latch SCR1 56 is commutated to conduct (FIG. 3). As a result, the desired specific signal state appears on output line 88. A diode 198 is connected between lines 186 and 188 in parallel with winding 190 since a flyback pulse is to be created while winding 190 is energized. Since switch 192 may be of somewhat complex construction, it is desirable that it not have to operate with the relatively large currents that may be introduced into electron flasher 178.

Therefore, to protect the contacts in switch 192, a switching SCR 199 is connected in line 200 between input lines 202 and 204 in parallel with switch 192. The gate 206 of SCR199 is connected to line 210
It is connected between a pair of voltage dividing resistors 206 and 208 which are further connected to a switch 192 located at the switch 192 . In the illustrated device, the relay contacts or contacts of switch 192 are connected to winding 19
When closed by a bias of 0, the gate 206 of SCR199 acts to commutate it "on" approximately at the same time as switch 192 closes. As a result, SCR199 takes substantially all of the current load that occurs with the ignition of electronic flash device 178. 5, another adapter device, generally designated 210, for use with flash ignition circuit 40 is shown.

As in the case of FIG.
2c can be used to connect to an electronic flash device 212 or the like. Such contacts 214 and 21
6 is illustrated. Adapter device 210 includes a load resistor 218 having an impedance value selected to approximate the impedance value of the ignition filament of flasher bulbs 60a-60c. Therefore, resistor 218
operates in the same manner as resistor 196 described in FIG. Specifically, this resistor 218 allows a sustained current to flow through the appropriate switching SCR 76a-76b and
56 performs a latch operation. The resistor 218 is
Lead 2 connected to terminals 214 and 216, respectively
20 and 222. Current limiting resistor 22
4 is connected to line 220 and serves to limit the current from ignition circuit 40. Line 220 is also connected to the base of NPN transistor Q. transistor Q
The emitter of 7 is connected to line 222 along line 226, and its collector is connected through line 228 to winding 230 of a lead-type relay, for example. Additionally, winding 230 is connected to a separate power source represented by a battery 232. Obviously, when adapter device 210 is energized by contacts 214 and 216, transistor Q7 is forward biased and winding 230 is energized by battery 232. As a result, the relay contact 234 is connected to the electronic flashing device 2.
Closed to ignite 12. Note that contacts 234 are included in the actuation output line 236 that exits the electronic flasher 212. A resistor 236 is placed between lines 214 and 216 and is reverse biased until transistor Q7 is used for switching. A diode 242 in line 244 is connected across winding 228. As in the embodiment of FIG. 4, this diode serves to suppress transient voltages, etc., created with deenergization of winding 228. The self-powered device shown in FIG. 5 prevents the camera power supply from consuming excessive current due to the operating current of additional circuitry included in the adapter device. Such an additional power source may have some value if the general power source of the camera using this control device is limited. 6, another adapter device for use with flash ignition circuit 40 is shown generally at 250.

As in the embodiment of FIGS. 4 and 5, any pair of terminals 62a-62c of ignition circuit 40 may be used to make an electrical connection to electroflash device 252. Such contacts are 254 and 252. The embodiment shown in FIG.
2 is directly switched or ignited without being electrically isolated from the control circuit as in the previous embodiment. Such a device can be used if the camera's integrated circuit is sufficiently resistant to damage due to overvoltages that may be created by the electronic flash device. Therefore, the actuation switch output of the electronic flash device 252 is at the contact point 258.
and 260 to the adapter device. In this embodiment, since the SCR is used to ignite the electronic flash device as described below, the ignition signal itself is the SCR.
It is sufficient to provide a gate current that brings the voltage to 0N, but
Since the gate current is a relatively small value, SC in Figure 3
Sufficient current cannot be applied to sustain conduction of R76a-76c.

For this reason, the adapter device 250 includes flashing light bulbs 60a to 60a.
There is a load resistor 262 having an impedance value or characteristic selected to approximate that of the ignition filament 60c. Therefore, resistor 262 operates in the same manner as resistors 218 and 196 in the embodiments of FIGS. 4 and 5. In particular, resistor 262 connects the sustained current to the appropriate switching SCR 76.
A current is passed through a to 76c, and a latch operation is performed by SCR156 (FIG. 3). Resistor 262 is connected to lead 2 associated with terminals 254 and 256, respectively.
64 and 266. A voltage divider circuit 268 configured by resistors 270 and 272 connects resistor 26
Connected in parallel with 2. The function of voltage divider circuit 268 is to create a signal at the appropriate level on line 274 to gate high voltage SCR 276 in an "on" state. SCR
The anode side of 276 is connected to contact 258 through line 276.
and its cathode is connected along line 280 to line 266. Line 266 may represent a connection with a common contact terminal of flash ignition circuit 40. In the illustrated device, when adapter device 250 is energized by contacts 254 and 256, SCR 276 is gated by line 274, closing the circuit across contacts 258 and 260.

When the electronic flash device 252 is ignited or switched on, the resistor 262 helps the flash ignition circuit 40 ensure successful ignition of the flash bulb. From Figure 7,
Shown are a standard electronic flash device 290, an adapter device 292, and an external housing 294 of a photographic camera as described in US Patent Application No. 2,468,91.

The outer housing 294 generally includes a cover 296, a lens mount 298, a light entry window 300 for photosensitive exposure adjustment,
It includes a start button 302, a focus knob 304, and a trim wheel 306. A flasher mounting structure 308 is located on the top of the housing 296 and is configured to receive and support the blade support and linear flasher electrical contact devices. This blade support is indicated at 310 and extends downwardly from the adapter arrangement 292. Terminals for a standard flashing device are constituted by a printed circuit on support 310, with a common terminal 312 and a switch actuation surface 31.
It has 4. As previously discussed, surface 314 serves to cause the camera's controller to perform a flash photography cycle. Of course, such switching or other adjustments of the control device may be made by each of the embodiments described above depending on the construction or design of the camera. The remaining terminals of support 310 lead to individual flashing bulbs, but are commonly connected to lead 264 in FIG. 6, lead 220 in FIG. 5, or lead 186 in FIG. Of course, common terminal 312 corresponds to lead 266 in FIG. 6, and leads 188 and 222 in FIGS. 4 and 5, respectively. The switching output of adapter 292 is provided to a synchronizing contact member made to mate with the mating end of switching cable 316 of electronic flashing device 290. This connection may be represented by contacts 258 and 260 in FIG. 6, or by corresponding contacts in FIGS. 4 and 5, respectively. Electronic flash device 290 includes the usual elements of such a device, including a power source, and a gas discharge lighting device.

The light exit window of the device is indicated at 318 and is located in the housing 23.
Installed in 0. It should be clear that the components of the adapter 292 are made as a monolithic structure within the electronic flasher, and the support blade 310 simply emerges from the bottom of the housing 320.

As minor modifications may be made to the apparatus described above within the scope of the invention herein recorded, all matter contained in the description with respect to the accompanying figures is for illustrative purposes only and is not to be construed in a restrictive sense. It must be understood that there are none.

[Brief explanation of the drawing]

FIG. 1 is a connection block logic diagram for a super-automated camera in which the adapter device of the present invention is utilized, and FIG. 3 is a partial circuit diagram showing in detail some of the components of the circuit of FIG. 2, FIG. 4 is a connection diagram of the adapter device according to the invention, and FIG. FIG. 6 shows another adapter device for use with the solid state flash ignition circuit described in connection with FIGS. 1-3, and FIG. Still another adapter device is shown, and FIG. 7 is a front view of the package type adapter device, the external housing of the camera, and the electronic flash device. 10... Exposure mechanism, 11... Mechanical linkage, 12... Electromagnetic drive device, 14...
Cycle control device, 22...photosensitive control circuit, 20
... Deterrent device, 26 ... Triker device, 34, 102 ... Focus actuator, 4
0... Flash ignition circuit, 42... Flash light bulb array, 52... Fixed delay device, 60a-60c...
...Flashing light bulb, 62a-62c...Terminal, 64
a~64c... Flashing light bulb circuit, 70...
... Current monitoring device, 72 ... Flashing light bulb switching circuit, 74 ... Power supply, 76a to 76c,
156,199,276...SCRl8O...
... Pulse generator, 86 ... Latch circuit, 94
, 96... Sequence logic circuit, 106, 13
4,198...Diode, Q1~Q7...
・Transistor, 178, 212, 252, 290...
...electronic flashing device, 180,210,250,2
52...adapter device, 190, 230, 22
8...Winding, 192...Switch, 232
...Battery, 268...Voltage divider circuit, 29
4,320... Housing, 296... Cover, 298... Luns mounting part, 300,318...
...Window, 302...Start button, 304...
... Focus adjustment knob, 306 ... Trim wheel, 308 ... Mounting structure, 310 ... Blade support, 314 ... Switch operation surface, 82, 11
6,114,132,136,138,154,158
,162,166,196,206,208,218,
224, 238, 262, 270, 272...
Resistor.

Claims (1)

[Claims] 1. The lamp is configured to use a flashing light bulb that originally has a predetermined resistance characteristic, and has an exposure control device and a terminal for coupling the flashing light bulb, and the terminal is activated in response to an ignition signal generated from the exposure control device. a flashing bulb ignition circuit for igniting a flashing bulb coupled to a flashing bulb; selectively activating the exposure control device according to load current characteristics when the flashing bulb is ignited; an ignition device for igniting an electronic flashing device in place of the flashing bulb in a camera comprising a monitoring circuit for generating an output signal for controlling the photographing cycle of the camera, an input terminal coupled to the terminal; has an output end for connecting an electronic flash device;
an electronic flash device ignition circuit that inputs an ignition signal generated from the exposure control device to ignite the electronic flash device connected to the output terminal; and the electronic flash device ignition circuit ignites the electronic flash device. the electronic flashing device ignition circuit such that the load current characteristics seen from the terminals of the flashing bulb ignition circuit when the electronic flashing bulb ignition circuit is turned on are substantially the same as the load current characteristics seen from the terminals when the flashing bulb is ignited; and a resistive impedance circuit connected to the ignition device for the electronic flashing device.