DE2652073A1 - FLASH AND CAMERA UNIT - Google Patents

Description

15th TT ₀ VuInLer 1976

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^ EST ELIiICTRIC CO., LTD. Osaka, Japan

Flash and camera device

The invention relates to a flash and camera device integrally incorporating a photo camera with an electric shutter for exposure control according to the brightness of a subject and an electronic flash device with a flash discharge lamp to emit flash light using up the in one Main discharge capacitor stored charge energy.

A known flash and camera device of this general type comprises a light receiving circuit with a light sensor, which at Photograph η in daylight mode on the brightness of the subject responds, and with an integrating capacitor, as well as a constant time circuit including an Itest resistor and the integrating capacitor for maintaining a Fixed value of the closing time of the electric shutter of the camera for flash photography, if the brightness of the recording ge ns tan-.des is less, so that depending on the choice of daylight or

Flash operation

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Flash operation either aer Lichtej: pfangskreis or the Eonstantzei switching in operation) nomne η wi rd.

With such a known comb, it is advisable to take photos in flashlight mode the number of den i'estwi who stood and den integrating capacitor including constant time circuit such as also the switching on of a switch for the electronic flash unit required while taking photos in daylight after the flash operation, the choice of the light receiving circuit s and turning off the main switch for the electronic flash unit required are. The operation is therefore cumbersome.

With such a system it is also often to be expected that that the main switch is turned on to take over the flashlight operation is overlooked, however, to select the constant-time circuit at the same time, or it may be the constant-time circuit selected, but forgot to turn on the main switch or, in the opposite case, it may be to take over the ambient light operation in connection with the flashlight operation the light temp fangskreis be selected, turning off the main switch for the Electronic flash units, however, are omitted. In these cases it happens then of course to an incorrect exposure.

The invention accordingly has for its object to provide a flash and To create camera device in which the Yorgang the choice of the light receiving circuit or the constant time circuit as well as the on and Switching off the main switch for the electronic flash unit simplified and the exposure errors that can be attributed to incorrect operation are avoided.

The above and other objects, features and gate parts of the invention will become more fully apparent from the description below the preferred embodiment of the invention with reference to the accompanying drawing. As the only figure on the accompanying drawing sheet shows

1 shows an electrical circuit diagram of a flash and camera device according to an embodiment of the invention.

In the drawing is an electronic shutter circuit 1 of a photo camera shown, comprising an integration circuit

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device 2 including a light receiving circuit with a light sensor 4 for perceiving the brightness of a recording and an integrating capacitor as well as a constant time circuit with a fixed resistor 5 and the integrating capacitor 6, a switch 7 “outer” upon initiation the öff longitudinal movement of the (not shown) shutter slats is opened, a circuit 8 which is reversed when a predetermined value rler charging voltage of the integrating capacitor 6 is reached, one at the Tmsteuer the circuit 8 for disengaging a (not shown) locking device for holding the Shutter slats in the open position actuatable magnet 9> which then causes the shutter slats to close, λχτΛ a normally open switch 10, which is closed when the trigger is actuated.

An electrical circuit 18 of the electronic flash device includes a GIe I current-equal current converter 13 to transform high the voltage of a DC voltage source 11, a main switch 12, a main discharge capacitor 14? the lait of the highly transformed Voltage of the DC-DC converter 13 is charged, a flash discharge lamp 15 and a conventional trigger circuit ΐβ for Feeding a high-voltage pulse to the lightning discharge lamp 15 » wherein the high voltage pulse when a switch is operated 17> when a predetermined value of the opening of the shutter blades is reached closes, from a trigger transformer 19 is supplied.

A switch 3 is in the same way as the main switch 12 connected that this switch 3 when closing the main switch 12 is turned over to the side of a contact a, while he is turned over when the main switch 12 is opened to the side of a contact b will.

It should now be the puncture method of the flash and camera device with the above structure can be explained.

(l) Photography in daylight mode: The main switch 12 is opened and the switch 3 for the integration circuit 2 is turned over to the side of contact b. When the shutter is released, the switch 10 is closed and the shutter blades are

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When Q η is in the opening position, the introduction of the: ■ Jev / e ^ ning ■ 5-way closing slats i- the l ^: opening position «the switch 7 is opened so that the light sensor 4 reacts to the brightness of the object being photographed and the '. Integration through the integrating capacitor 6 can be used.

cie Τ.ε de voltage of the integrating Xonderisa sector 6 reaches a predetermined value, the circuit θ is reversed and the locking of the Yerschlußlamellen by the magnet 9 is canceled, so that? the verse blue lamellas close. In this way, the recording process is ended with a corresponding exposure time.

(2) Photo initial η in slotted light operation: Via main switch 12 is closed and the ScIialter 3 is after the side of the Sontakts a thrown. The DC-DC converter 13 is in Put into operation so there ;? the B. main discharge! condenser 14 bit; to a specific voltage is charged. i? enn now the shutter release takes place, the switch 7 'is opened as before, the switch 10 is closed and the YschluElamellen move into the open position. On the other hand, the integrating capacitor 6 is charged via the resistor 5, and if the charging voltage a reaches a certain value, the circuit 8 for actuating the Trigger circuit 16 reversed so that the flash discharge lamp 15 below Depletion of the charge energy of the main discharge capacitor 14 to the Elitzlichtaussendur.g is put into operation.

The way of actuating the trigger circuit Io by Dh controlling the circuit S is known and therefore needs not to be discussed in more detail.

When reversing the circuit S, the lock dei 'wear lamellae immediately canceled by the magnet 9, but there from the moment of actuation of the Ilagneten 9 until it is canceled the locking of the shutter slats a mechanical delay is to be taken into account, the shutter lame lie η during the Time span of the light emission of the flash discharge lamp 15 not yet closed.

If you want to return to daylight after taking the flash

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The main switch 12 is opened. The switch 3 is therefore thrown to the side of the Xontakts b and which incorporate the light sensor 4 and the integrating capacitor 6 Grabbing light-sensitive circuit is put into operation. This is the start of the day's operations.

When explaining how it works, the above mentioned the closing and opening of the main switch 12 is lifted, but it should be noted that the switchover between daylight and flashlight operation can be done just as well by operating the switch 3.

Claims "M

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Claims (2)

Claims 1. Blitz- und Käme rage advises, characterized by a direct current-direct current converter (13) to high transform η the voltage of a GrIe I voltage source (ll), a lightning discharge lamp (15) for the emission of flashlight using the charging energy of a direct current DC converter (13) connected and charged to a high voltage main discharge capacitor (14)> a "when photographing in daylight mode with the shutter slats open to record and integrate the light emanating from a subject ge light receiving circuit (4 ₅ 6) actuatable, one when photographing in flash mode with the shutter slats open for integration with a given time constant actuatable constant time circuit (5, 6), a circuit (8) that can be reversed to a predetermined value when the integration value of the light receiving circuit (4> 6) or the constant time circuit (5, 6) increases, one when reversing the circuit (8) to A triggers a closing movement of the shutter blades actuatable magnets (9)? a selector switch arrangement (3 > 12) and a trigger circuit (ΐβ) which can be actuated when photographing in flash mode after reversing the circuit (8) for exciting the flash discharge lamp (15). 2. Flash and camera device according to claim 1, characterized in that that the light receiving circuit (4 »6) is a series connection of a Includes light sensor (4) and an integrating capacitor (6), while the constant-time circuit (5, 6) is a series connection of a Pestwider stand (5) and the integrating capacitor (6) includes. 3 flash and camera device according to claim 1, characterized in that that the selection switch assembly (3, 12) has a first switch (12) for connecting the DC voltage source (II) to the DC-DC converter (13) and to switch them off from this and one 709821/0719 -Λ 26b2U73 A second switch (3) to turn on the constant time circuit (5) 6) to the circuit (8) when taking photos in flash mode and to turn on the light receiving circuit (4, 6) to the Includes circuit (θ) when photographing in daylight mode, being the first and second switches (12 $ 3) in the sense a connection of the constant-time circuit (5, 6) by the second Switch (3) when closing the first switch (l2) and one Switch on the light receiving circuit (4 »6) through the second Switch (3) when opening the first switch (l2) are connected to one another. 4. Flash and camera device according to claim 1, characterized in that that the first and the second switch (12 * 3) through simultaneously one and the same beta ti supply process can be switched. 709821/0719