JPS60186173A - Electronic still camera - Google Patents

Abstract

PURPOSE:To obtain a picture of good quality without unevenness by performing single-shot lighting in still photographic mode when a shutter is fully closed or continuous lighting in movie photographic mode when a record switch is pressed. CONSTITUTION:When a signal indicating the full opening state of the shutter 7 is sent out in still photographic mode, a stroboscope control circuit 34 is excited to send out a lighting pulse PF and the strobe lighting is started. A vertical synchronizing signal V-BLK is supplied to an AND gate in movie photographic mode, so the AND gate G1 sends out a pulse signal for a period corresponding to a vertical blanking period and the strobe control circuit 34 is excited to turn on a stroboscope.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides an electronic still camera without a shutter that appropriately controls the timing of strobe light emission, thereby making it possible to perform strobe photography both when shooting photos and when shooting movies. It is related to.

Prior Art and Problems In recent years, it has become possible to photograph objects purely electronically by combining imaging devices such as solid-state imaging devices and image pickup tubes with recording devices that use inexpensive and relatively large-capacity magnetic disks as recording devices. Electronic still cameras have been devised that take still pictures, record them on a rotating disk, and reproduce the images using a separate television system or printer.

In addition, the electronic still camera can be used as a video camera for movie shooting by transmitting the image information signal obtained by the imaging section of the electronic still camera to an external γr++ image information recording device such as a VTR via a suitable adapter. It is also possible to use it as

When performing strobe photography using such an electronic still camera, the following disadvantages occur. That is, when performing still photography (hereinafter referred to as still photography mode), for example, if a strobe is emitted with the focal plane shank not fully open, bright areas and dark areas will coexist in one screen. As a result, when reproducing and visualizing a front image with uneven exposure,
This results in an image capture screen that is extremely difficult to see.

In addition, when shooting a movie with the shack open (hereinafter referred to as movie shooting mode), if the strobe is fired at an inappropriate timing, it will cause the flash to appear on one screen as in the case of still shooting. The bright part and the 11Δ part are mixed together.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to appropriately control the flash timing of a strobe to obtain appropriate images even when shooting stills and movies. The purpose of the present invention is to provide an electronic still camera that enables the following.

According to the present invention, in an electronic still camera in which either a still shooting mode or a movie shooting mode is selected, when the still shooting mode is selected, the still mode signal is transmitted to the movie shooting mode. When the mode is selected, there is a selection means for transmitting a movie mode signal, a shack for intermittent image information light irradiated to the photographing element, a shack for controlling the opening and closing of the shutter in response to a still mode signal, and a movie mode signal. a jack control means that sets the shank fully open in response to the shank, and a jack control means that detects a still mode signal and a movie mode signal so that strobe photography is performed when the shutter is fully open in the still shooting mode, and a vertical synchronization signal in the movie shooting mode. and control means configured to start strobe light emission at the start of the vertical retrace period in synchronization with.

Hereinafter, the present invention will be described in detail with reference to the 14th page.

Embodiment of the Invention FIG. 1 shows an embodiment of an electronic still camera to which the present invention is applied.

In Figure 1, 1.2 is a lens, 4 is an aperture, and 6 is a light receiving M.
7 is a focal plane shutter; 8 is an image sensor such as a solid-state image sensor or an image pickup tube; and 10 is an image signal sent from the image sensor 8 which is transferred to a magnetic disk 22 by four people.
12 is a synchronization signal generation circuit for sending out a vertical synchronization signal V-BLK, etc.; 14;
18 is an exposure control circuit; 18 is a motor for steady rotation of the magnetic disk 22; 20 is the motor 18;
a servo control circuit for maintaining the at a steady rotational speed; 24;
2 is a recording head for recording images on a magnetic disk;
Reference numeral 6 indicates a reference phase detection means for detecting a PC pin (not shown; protrusion made of gold JF made of phase I No. 8) embedded in the magnetic disk, and 2 indicates a recording switch (not shown) for controlling the start of image recording. RECSW), 34 is a strobe control circuit that controls the strobe light emission timing and light emission duration time, 36
is an Xe arc tube, and NOD is a mode selection signal sent from a mode selection switch (not shown) for selecting either still photography or movie photography. Further, G1, G, 2 are AND gates, G3 is an OR gate, 40 is a shutter control circuit, 42 is a front curtain drive circuit for the focal plane shutter, 44 is a rear curtain drive circuit for the focal plane shutter, and 46 and 48 are AND gates. These are inverters connected to the input terminals of G2.

Further, 50 is an image recording device such as a VTR or a writable compact disc connected to the recording signal processing circuit IO via an adapter (not shown).

In this embodiment, a VTR is used.

However, the recording signal processing circuit 10 is configured in advance so that the image signal supplied to the VTR 50 is sent out only when the movie mode F'M interpretation signal NOD is set to a high level (movie mode). put.

FIGS. 2A to 2G are operation timing diagrams when still photography, that is, one-way 71 photography is performed using the electronic still camera shown in FIG. In this figure, (A) is a waveform diagram of the vertical synchronizing signal V-BLK, and its low level represents the vertical retrace period.

Also, Figure I (B) shows the recording switch ('RFC: 5W
) 28 press (manual) Timing to indicate lR1 point,
(C) of the figure shows a front curtain drive signal sent from the front curtain drive circuit 42, (D) shows a trailing curtain drive signal -5 sent from the rear curtain drive circuit 44, and (E) shows the shack 7. The output signal of A N D gate G2 representing the fully open period of A
The light emission pulse PF is sent out from the strobe control circuit 34 in synchronization with the pulse ST sent out from the ND gate G3. FIG.

Next, with reference to FIGS. 1 and 2, the operation in the still photography mode when the shank speed is shorter than 1/60 seconds will be described.

(2) First, a low level signal is supplied to the AND gate G1 and the in-hook 48 as a mode selection signal MOD for specifying the still imaging mode, and the AND gate G1 is closed. Therefore, the inverted vertical parallel jOJ signal sent from the input/hatter 14 is not supplied to the OR gate G3 via the AND gate G1.

(2) After that, when the recording switch (REC5W) 28 is pressed, a high level signal is sent from the front curtain drive circuit 42 of the focal plane shank in response to the output signal from the shack control circuit 40 (see Fig. 2). C')). At this time, since the trailing curtain drive circuit 44 outputs a low 17-bell signal (see FIG. 2(D)), the output signal is inverted via the in-hark circuit 4G and becomes high level. Similarly, the low level mode selection signal MO
D is supplied to the AND gate G2 via the inverter 48.

■ Therefore, from AND gate G2, Shack 7 is fully open! A signal indicating (see FIG. 2(E)) is sent out, and is sent to the strobe control circuit 34 via the OR gate G3. That is, in synchronization with the pulse ST sent out from the OR game G3, a light emission pulse PF is sent out from the strobe control circuit 34, and strobe light is emitted.

■ Thereafter, in order to close the shank forward, a high-level signal is sent from the trailing curtain drive circuit 44 (see Fig. 2 (D
)reference). Then, AND game) G2 has impark 4
6 is supplied with a low level signal, thus A
ND gate G2 is closed.

(2) Then, in order to cancel the read prohibition of image information, the read inhibit signal INH is set to a low level, and the image signal is read from the image sensor 8 (see FIG. 2 (G)).

In this way, when shooting stills, I would like to shoot 110 kills at the shutter tree and 110 kills.
Exposure unevenness within the field can be removed.

FIGS. 3A to 3G show operation timings when a movie is shot using the electronic still camera shown in FIG. In this figure, (A) is the vertical synchronization signal V-B
LK, (B) is the press timing of the recording main f (REC5W) 28, (C) is the leading curtain drive signal, (D) is the trailing curtain drive signal, and (E) is the vertical retrace period (that is, the vertical synchronizing signal). (F) is the light emission pulse PF sent from the strobe control circuit 34, and (G) is the read inhibit signal INF.

The operations in the movie shooting mode are as follows.

(2) As the mode selection signal MOD, a high level signal specifying the movie shooting mode is supplied to the AND gate G1 and the input terminal 48. Therefore, inverter 4
8 supplies a low level signal to the AND gate G2, so the AND gate G2 is closed.

■ On the other hand, in the movie shooting mode, it is necessary to keep the shutter 7 fully open.

In response to the 4R signal MOD, the front curtain drive signal is held at a high level (see 31Δ(C)), and the rear curtain drive signal is held at a low level (see FIG. 3(D)). put.

However, as mentioned above, since a low level is always applied to one input terminal of the AND gate G2 (ie, the output of the inverter 48), the AND gate G2 is never opened.

■ The vertical synchronization signal V-BLK sent from the synchronization signal generation circuit 12 is sent to the AND cable 1 via the impark 14.
・Supplied to G1. Furthermore, as described above, the high level mode Hikone I No. 8 MOD (movie mode) is applied to the other input terminal of the AND cable 1-Gl. Therefore, a pulse signal is sent from ANDK-1/G1 only during a period corresponding to the vertical retrace period (see FIG. 3(E)).

■ Thus, the output pulse of ANI]G1-Gl is O
The strobe control circuit 34 is energized via the R game 1-03.

■ Image readout from image sensor 8, Figure 3 (G)
As shown in FIG. 3, this is performed continuously from the next field I.

In this way, the 1-bee shooting mode 11 runs t,
It is possible to fire a strobe every vertical retrace period.

It goes without saying that the circuit operation of the present embodiment described above can be replaced by a microcomputer or the like, and the circuit configuration is not limited to that of the present embodiment.

Note that it is also possible to change the light emission time using the strobe control circuit 34, thereby obtaining an effect similar to that of a high-speed shutter.

In this case, if a circuit such as that shown in FIG. 4 is used as the strobe control circuit, the light emission time can be freely controlled 21.
It is possible to do so. This circuit includes a main capacitor 64, a light emitting circuit consisting of a light emitting circuit 64, and a strobe light l trigger circuit 6 that triggers the light emitted by the light emitting circuit.
6, a light emission time control circuit 72 that controls light emission time, and the like. In this circuit, synchro switch,
When the discharge tube 60 is triggered by closing the switch 62, a predetermined voltage is applied to the gate of the first thyristor 68, and the thyristor 68 is turned on. As a result, the energy charged in the main capacitor 64 is discharged through the discharge tube CO and the cylisk 68, and "stroboscopic light emission" is performed.

On the other hand, when the reflected light of the strobe light is collected by the photosensor 74 and reaches a certain amount of light, that is, the value set in the light emission time control circuit 72, which is composed of an integrating circuit, an amplifier circuit, and a switching circuit, the light emission time control circuit 72 The trigger circuit is activated, and a predetermined voltage is applied to the second cyrisk 70. As a result, the thyristor 70 is turned on, and the stop capacitor 76, which has been sufficiently charged in advance through the resistors 7B and '80, releases energy in the direction of the arrow, and the thyristor 68 is turned off, stopping charging. In this way, time control of strobe light emission is performed.

vinegar! - Ropo light emission starts at the start of the retrace period of the vertical synchronization signal, but it is preferable to set the light emission to be completed by the end of the strobe (approximately 1.2 to 1.3+ns).

Effects of the Invention As described above, according to the electronic still camera according to the present invention, when the still shooting mode is in the dark, a single flash is emitted when the shutter is fully open, and in the movie shooting mode, the flash is emitted vertically while the recording switch is pressed. In synchronization with the retrace period of the synchronization signal, i!
l! Since continuous light emission can be performed, there is an advantage that a high-quality image without unevenness can be obtained.

[Brief explanation of drawings]

Figure 1 is a block diagram showing one embodiment of the present invention, Figures 2 (A) to (G) are timing diagrams showing operations in still mode, and Figures 3 (A) to (G) are movie mode 1. 4 is a timing diagram showing the operation of the II da. FIG. 4 is a circuit showing an embodiment of the strobe control circuit in FIG. 1. 2...Lens. 4... Aperture, 6... Light reception amount sensor, 7... Shutter, 8... Image pickup element, 10... Recording signal processing circuit, 12... Synchronization signal generation circuit, 14... Inverter , 16... Exposure control circuit, 18... Motor, 20... Servo control circuit, 22... Magnetic disk, 24... Recording head, 26... Reference phase detection means, 2nd... - Recording switch (RECSW), 30... Mode selection switch, 34... Strobe control circuit, 38... Arc tube, 46.48... Inverter, 50... Image recording device (VTR), ( , 1-03...Gate, V-BLK...Vertical synchronization signal, ST...Trigger signal, PF...Light emission pulse, INH...Read inhibit signal, 60...Discharge tube, 64 ...Main capacitor, 6B...Strobe light emission; -Riga circuit, 72...Light emission time control circuit. 18Iltla GO-186173 (6) □ Procedural amendment April 11, 1980 Commissioner of the Patent Office Kazu Wakasugi Mr. Husband, Patent Application No. 59-4142 (No. 1-1 Name of Invention Electronic Still Camera, Person Making Amendment Relationship to the Case Patent Applicant (520) Fuji Photo Film Co., Ltd. 1, Agent Address: 9F, Akiyama Building, 2-3-22 Toranomon, Minato-ku, Tokyo 105 3, Subject of amendment: "2. Scope of Claims" column of the specification, "3. Detailed Description of the Invention" column and "4. , "Brief explanation of the drawings" column? Contents of the amendment As shown in the attached sheet 1) The claims of the specification are amended as shown in the attached sheet. 2) "1g is a magnetic disk n" on page J, line 19 of the specification letter
"tg is a steady rotation" is corrected to "tg is a rotating magnetic disk." 3) Correct "close the shutter forward" on the 9th line of page 9 to "close the shutter fully." 4) On the same page, lines 75-17, “And...
. . . read out" is corrected to "and, during the period of l field immediately thereafter, the read inhibit signal IN)l is set to a low level and the image signal from the image sensor l is read out.'' 5) Correct the [stop signal INF J on page 10, line 12] to [stop signal IN'HJ. 6) Set No. 14 to ``(approximately 1.2 to 1.3 r
ns) Delete J. , line n, the 1st line of the 1st page of the same page, and the 3rd line of the 16th page of the same page are corrected to the ``vertical blanking signal J.'' 7) More than correcting the eye's "inverted vertical synchronization signal" with the "inverted vertical blanking signal" [Attachment] 2. Claims: Electronic still capable of selecting either still shooting mode or movie shooting mode In the camera, a selection means for transmitting a still mode signal when the still shooting mode is selected and a movie mode signal when the movie shooting mode t-a is selected; and image information light irradiated to the image sensor. a shutter that opens and closes the shutter intermittently in response to the still mode signal; shutter control means that controls opening and closing of the shutter in response to the still mode signal and sets the shutter in a fully open state in response to the movie mode signal; A movie mode signal is detected, and when the shutter is fully opened in a still shooting mode, strobe light is emitted when the shutter is fully opened, and when in a movie shooting mode, strobe light is started at the start of a vertical blanking period in synchronization with a vertical blanking signal. An electronic still camera characterized by comprising a control means as described above.

Claims (1)

[Claims] In an electronic still camera that can select either a methyl photography mode or a movie photography mode, a still mode signal is transmitted when the still photography mode is selected, and a still mode signal is transmitted when the movie photography mode is selected. In some cases, the present invention includes a selection means for transmitting a movie mode signal, a shutter for intermittent image information light irradiated onto an image sensor, and a shutter for controlling opening and closing of the shutter in response to the still mode signal, and a selection means for transmitting a movie mode signal. a shutter control means for responsively setting the shutter to a fully open state, and detecting the still mode signal and the movie mode signal to emit strobe light when the shutter is fully open when in a still shooting mode, and setting the shutter in a movie shooting mode. 1. An electronic still camera comprising: control means for starting strobe light emission at the start of a vertical retrace period, sometimes in synchronization with a vertical synchronization signal.