JP2593448B2 - Imaging device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging apparatus capable of setting exposure and the like by an up / down switch and having a playback function alone or by connecting an adapter. is there.

[Prior Art] In an imaging apparatus, there are various elements that must be determined as shooting conditions (for example, AE mode, shutter time, aperture, white balance, exposure compensation, etc.), and an operation member is attached to each of them. However, if the number of operating members becomes too large, it is difficult to secure a place for installing them in a compact device.
The appearance is also rough.

Therefore, in recent years, it is conceivable to use a switch for selecting which photographing condition is to be operated and, after the photographing condition is selected, to set parameters in the photographing condition using an up / down switch.

On the other hand, the imaging device can have a playback function,
In that case, it is necessary to perform an operation of advancing or returning the frame.

In the image pickup apparatus having the above-described configuration, if operation members for advancing and returning frames are separately provided, there is a disadvantage that a space is taken up, costs are increased, and operations are complicated.

[Problems to be Solved by the Invention] The present invention has been made in view of such a point, and the photographing conditions (or the parameters thereof) are determined by an up / down switch, and are used alone or by connecting an adapter. In an image pickup apparatus capable of having a reproducing function, the above-mentioned conventional disadvantages described above can be solved by appropriately configuring the frame feed at the time of reproduction, that is, the track feed, by using an up / down switch for determining photographing conditions. It is an object of the present invention to provide an imaging device that is improved.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides an image pickup apparatus comprising: Reproducing means (6, 7, 20) for reproducing the video signal recorded on the recording medium; mode switching for switching between a recording mode for recording by the recording means and a reproducing mode for reproducing by the reproducing means; Means (11), up / down signal generating means (12, 13) for generating an up / down signal, and an up / down signal generated by the up / down signal generating means when the recording mode is switched by the mode switching means. A first setting and holding means (19) for setting and holding the exposure condition step by step in accordance with the up / down signal, and an a.c. A second setting holding means for switching and setting a track number one by one in accordance with an up / down signal generated by the up / down signal generating means; and the first setting holding means in a recording mode. A control unit (10) for recording a video signal under the exposure condition held by the control unit, and controlling the playback unit to perform playback according to the track number held by the second setting holding unit in a playback mode. , Is provided.

According to the present invention, it is possible to prevent an increase in size, a complicated operation, and an increase in cost due to an additional operation member, to have a clean appearance, and to improve the operability. A device can be obtained.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings.

Here, in order to make the description simple and easy to understand, it is assumed that the imaging apparatus has only the shutter speed priority in the shooting mode, and uses an up / down switch to set the shutter time for that.

 FIG. 1 shows an electric circuit diagram of one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an optical system for forming a subject image. 2a is an aperture driver and 2b is an aperture. 3a is a shutter driver, and 3b is a shutter. Aperture 2b and shutter
3b are both inserted into the optical path in the imaging optical system 1.

Reference numeral 4 denotes an image sensor such as a CCD, which converts a subject image formed on the light receiving surface of the CCD 4 by the optical system 1 into an electric signal.

Reference numeral 5 denotes a recording signal processing circuit for processing a signal from the image sensor 4, reference numeral 6 denotes a recording circuit, and reference numeral 7 denotes a reproduction signal processing circuit. Reference numeral 8 denotes an output terminal for extracting a reproduction signal from the processing circuit 7 to the outside.

Reference numeral 9 denotes a photometric circuit for measuring the brightness (Ev) of the subject when the photometric power switch 9a is turned on. Reference numeral 10 denotes an arithmetic control circuit for inputting a photometric output from the photometric circuit 9, and reference numeral 11 denotes a mode switch for switching between photographing and reproduction.

Reference numerals 12 and 13 denote circuits for generating a single positive pulse when the switch is pressed once in conjunction with an up / down switch, and here, for convenience, will be referred to as a down switch and an up switch, respectively.

Reference numerals 14, 15, 16 and 17 denote AND gates, in each of which the output C goes high only when the inputs a and b are both high.

Reference numerals 18 and 19 denote up / down counters as a frame number counter and a shutter time counter, respectively. When one positive pulse is input to each D terminal, an output OU is output.
T decreases by one, and when one positive pulse is input to each U terminal, the output OUT increases by one.

Reference numeral 20 denotes a head position driver, and according to a frame number counter 10A incorporated in the arithmetic control circuit 10 during shooting,
At the time of reproduction, the position of the recording / reproducing head is changed according to the output of the counter 18 to perform frame advance, that is, track advance.

 Reference numeral 21 denotes a release switch for instructing start of photographing.

In the embodiment of the present invention described above, the arithmetic control circuit 10
Controls the operation according to a control procedure as shown in FIG. 3, for example.

The control of this operation will be described below with reference to the flowchart of FIG.

(I) Imaging Mode First, in step 100, when a power switch (not shown) is pressed, a program starts.

Then, in the shooting mode, the operation of the mode changeover switch 11 causes the arithmetic and control circuit 10 to input that the imaging apparatus is in the shooting mode (step 101).

In this state, the arithmetic and control circuit 10 sets the terminal 10b to low level and the terminal 10d to high level. Thereby, input from AND gates 14 and 15 is prohibited, and input from AND gates 16 and 17 is permitted.

By doing so, the shutter time setting counter 19 becomes operable, and the output of the counter 19 increases and decreases by one each time the up switch 13 and the down switch 12 are pressed once.

For example, as shown in FIG. 2, by setting the shutter time and the counter output to correspond to each other, the shutter time can be set by inputting the output of the counter 19 to the arithmetic control circuit 10 from its terminal 10e. Can be. This is read in step 102.

 The counter output is represented by Tv value (Time Value) Tv = log2 (1 / shutter second).

In this state, when the power is turned on in step 100, the photometric power switch 9a is also turned on, so that the photometric circuit 9 is operating, and the output (Ev value) of the photometric result is sent to the arithmetic and control circuit 10 at the terminal. It is input via 10a (step 103).

Thus, the arithmetic and control circuit 10 calculates an aperture condition for exposing the image sensor 4 by an appropriate amount of light in accordance with Av = Ev-Rv, where Av = log2 (FNo) ² (step 104).

Thereafter, when the release switch 21 is pressed during shooting (step 104), the aperture 2b and the shutter 3b are respectively driven via the drivers 2a and 3a so as to set the aperture value and the shutter time corresponding to the above Av and Tv. Is done. Thereby, the image pickup device 4 is exposed (step 10).
6) The exposure output is processed by the recording signal processing circuit 5 into a recordable signal.

On the other hand, since the recording circuit 6 is in the recording mode by the signal from the terminal 10g of the arithmetic and control circuit 10 at this time,
The output from the recording signal processing circuit 5 is written from the recording circuit 6 to the recording medium via the recording / reproducing head (step 107).

After the recording is completed, the frame number counter 10A in the arithmetic and control circuit 10 is incremented by one, and the count output is input to the recording / reproducing head position driver 20, and the frame is advanced, that is, the track is advanced (step 108). .

(Ii) Reproduction mode Next, the reproduction mode will be described.

Operation control circuit by operation of mode change switch 11
If it is input to 10 that the imaging device is in the reproduction mode, this is determined in step 101, and the process proceeds to the reproduction mode.

In this state, the arithmetic and control circuit 10 sets the terminal 10b to a high level and the terminal 10d to a low level. As a result, input from the AND gates 14 and 15 is permitted, and the AND gate 16
And input from 17 is prohibited.

By doing so, the frame number counter 18 becomes operable, and in step 110 or 112, it is determined whether or not the up switch 13 and the down switch 12 have been pressed, and each time these switches are pressed once, In step 111 or 113, the output of the counter 18 is increased and decreased by one, respectively.

At the same time, the output of the counter 18 is
The head position driver 20 is driven via the terminal 10j to drive the recording / reproducing head at a desired frame position, that is, a track position.

At this time, the recording circuit 6 is in the reproducing state by the output from the terminal 10g of the arithmetic and control circuit 10, and after the output picked up from the recording / reproducing head is amplified to an appropriate level by a preamplifier or the like, the reproduced signal processing circuit 7 is output.

The reproduction signal processing circuit 7 processes the reproduction signal from the recording circuit 6 into a predetermined video signal such as NTSC, RGB or the like, and outputs the signal from an output terminal 8.

In this embodiment, for the sake of simplicity, a case was considered in which, during shooting, the shutter was set only with the up / down switch at the time of the shutter time. In addition, the AE mode, aperture, white balance, and the like were set in the same manner. When setting,
It is clear from the above description that the present embodiment can be applied as it is.

Still further, the present invention relates to an imaging device for a moving image,
It is apparent that the present invention can be applied to a playback mode having a still image playback function in the playback mode.

[Effects of the Invention] As described above, according to the present invention, increase in size, complexity of operation, increase in cost, and the like due to additional operation members are prevented, and a clean appearance is achieved. In addition, an imaging device with improved operability can be obtained.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a table showing an example of the correspondence between the output of the shutter time setting counter 19 shown in FIG. FIG. 3 is a diagram showing an example of a flowchart. 1 Optical system 2a Aperture driver 2b Aperture 3a
... Shutter driver, 3b Shutter, 4 ... Image sensor (CCD), 5 ... Recording signal processing circuit, 6 ... Recording circuit,
7 ... reproduction signal processing circuit, 8 ... reproduction signal output terminal, 9
………………………………………………………………………………………………………………………… ………………………………………………………………………………………….
12 pulse generator (down switch), 13 pulse generator (up switch), 14, 15, 16, 17 AND gate, 18 frame counter, 19 shutter time counter, 20 ... Head position driver, 21 ... Release switch.

Continuation of the front page (56) References JP-A-60-219875 (JP, A) JP-A-61-10371 (JP, A) JP-A-60-83478 (JP, A) JP-A-60-50675 (JP) JP-A-61-72301 (JP, A) JP-A-61-96880 (JP, A) JP-A-59-195630 (JP, A) JP-A-60-173526 (JP, A) 60-20689 (JP, A) Fully open Showa 61-61694 (JP, U)

Claims (1)

(57) [Claims] 1. Recording means (5, 6, 20) for recording a video signal on a recording medium for each track, and reproducing means (6, 7, 20) for reproducing the video signal recorded on the recording medium. Mode switching means (11) for switching between a recording mode for performing recording by the recording means and a reproduction mode for performing reproduction by the reproduction means; and up / down signal generation means (12, 13) for generating an up / down signal. And 1) setting and holding the exposure condition step by step in accordance with the up / down signal generated by the up / down signal generation means when the mode is switched to the recording mode by the mode switching means. Means (19), a track in response to an up / down signal generated by the up / down signal generation means when the mode is switched to the reproduction mode by the mode switching means. Second setting storage means for the one track switching setting holds No. (18)
In the recording mode, the video signal is recorded under the exposure condition held by the first setting holding unit, and in the playback mode, the playback unit plays back the track according to the track number held by the second setting holding unit. And a control means (10) for controlling the image pickup apparatus to perform the operation.