JP2002023231A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera, in which increase of the size of the camera is prevented by efficiently utilizing dead space and other circuits are separated from noise sources, by combining noise generating sources. SOLUTION: The camera is provided with a flash-emitting section which conducts flash emission, a recharging circuit which includes a first boosting circuit that stores flash-emitting energy for the flash emission, a second boosting circuit which differs from the first boosting circuit and an electronic circuit substrate, on which flash-emitting electrical parts are mounted for flash emission. The first and the second boosting circuits are mounted on the substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly, to a camera for storing flash light emission energy for flash light emission.
And a second booster circuit for a display unit such as a liquid crystal display device that displays photographing information of the camera.

[0002]

2. Description of the Related Art As a camera having a display unit such as a liquid crystal for displaying photographing information of the camera as shown in the title, Japanese Utility Model Application Laid-Open No. 5-2-5-2.
2. Description of the Related Art A related art of a camera having a liquid crystal display unit as disclosed in Japanese Patent No. 7741 is known.

In the prior art disclosed in Japanese Utility Model Laid-Open No. Hei 5-27741, a light source driving circuit for a liquid crystal backlight of a liquid crystal display unit is arranged above a pentaprism of a single-lens reflex. I have.

Thus, according to the conventional technique disclosed in Japanese Utility Model Laid-Open No. 5-27741, the influence of noise generated during the step-up operation in the liquid crystal backlight light source drive circuit without increasing the size of the camera body. Can be suppressed by increasing the distance from other circuits.

A camera having a display unit such as a liquid crystal for displaying photographing information of the camera as shown in the title is disclosed in
2. Description of the Related Art A related art of a camera having a liquid crystal display unit as disclosed in JP-A-305306 is known.

According to the conventional technique disclosed in Japanese Patent Application Laid-Open No. H11-305306, an electric component for driving a light source for a liquid crystal backlight of a liquid crystal display portion is provided in a dead space inside a grip on a back cover side of a camera. It is arranged.

As a result, Japanese Patent Application Laid-Open No. H11-30530
According to the conventional technique disclosed in Japanese Patent Publication No. 6 (1994), while avoiding the entire back cover from being thick, the noise generated from the booster circuit for driving the light source for the liquid crystal backlight is kept away from other circuit components, thereby preventing the adverse effects of the noise. can do.

[0008]

By the way, inside the camera, there is provided an electroluminescence including a light emitting diode (LED) driven by a booster circuit for driving a light source for a liquid crystal backlight of a liquid crystal display section as described above. In addition to the element driving circuit, there is a charging circuit including a circuit that performs a boosting operation like a strobe charging circuit, that is, a boosting circuit that stores flash light emission energy for flash light emission.

Therefore, the noise generated in the boosting operation of the boosting circuit which performs the boosting operation like the strobe charging circuit is the same as the countermeasure in the conventional electroluminescent element driving circuit as described above. In order to prevent adverse effects due to leakage to other circuits, it is necessary to take measures such as shielding or arranging them at a position distant from the other circuits.

However, at this time, if noise sources such as a boosting circuit for performing a boosting operation like a strobe charging circuit and a boosting circuit for driving a light source for a liquid crystal backlight are separately arranged, noise generation of each of them is performed. As a countermeasure against individual noise leakage, the source needs a shield process or a space for keeping a distance from other circuits, which is disadvantageous in terms of mounting space and cost.

The present invention has been made in view of the above circumstances, and has a charging circuit including a first booster circuit for storing flash light emission energy for flash light emission as a noise source; In a camera having a second step-up circuit for a display unit such as a liquid crystal to be displayed, the size of the camera can be prevented, the mounting space and cost can be reduced, and a noise source can be kept away from other circuits. It is an object of the present invention to provide a camera capable of performing the following.

[0012]

According to the present invention, in order to solve the above problems, (1) a flash light emitting section for performing flash light emission, and a first booster circuit for storing flash light emission energy for the flash light emission , A second booster circuit different from the first booster circuit, and an electric circuit board on which a flash light emitting electric component for flash light emission is mounted, wherein the first A camera is provided, wherein the booster circuit and the second booster circuit are mounted on the electric circuit board.

According to the present invention, in order to solve the above-mentioned problems, (2) a display unit for displaying photographing information of a camera and a display unit including a light source unit for illuminating the display unit are further provided. The camera according to (1) is provided, wherein the booster circuit is a booster circuit for driving a light source unit of the display unit.

According to the present invention, in order to solve the above-mentioned problems, there is provided (3) the camera according to (1), wherein the light source section of the display unit is an electroluminescent element.

In the camera according to the present invention as described above, a flash charging circuit, which is a relatively large member among the camera's electric components, that is, the flash light, is provided on the electric circuit board on which the electric component for flash light emission is mounted. A charging circuit including a first booster circuit for storing flash light emission energy for light emission is mounted.

For this reason, the first circuit board is mounted on an electric circuit board where a dead space is easily generated between the camera body and the receiving camera body.
A second booster circuit different from the above booster circuit, for example, a booster circuit for driving a liquid crystal light source is arranged.

As described above, in the camera according to the present invention as described above, by effectively utilizing the dead space, the size of the camera is prevented from being increased, and the mounting space and the cost are advantageous.

At the same time, in the camera according to the present invention as described above, the noise sources in the camera are substantially combined at one place, so that the noise sources can be kept away from other circuits. It becomes possible.

Furthermore, it is possible to stabilize the power supply by treating the shielding process in common as a noise countermeasure, or by using a common ground line for the booster circuit to make it thicker.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual block diagram showing a simplified configuration of an embodiment of a camera according to the present invention.

That is, as shown in FIG. 1, the camera according to the present invention has a strobe (charge) circuit 601 for flash light emission including a booster circuit serving as a noise source, and a booster for an electroluminescence (EL) element serving as a noise source. E including circuit
A high voltage system 60 having an L drive circuit 602, a distance measurement circuit 611, a photometry circuit 612, and an arithmetic control circuit (CPU) 61
3 and a film feeding circuit 62
1. a mechatronics system 62 having a photographing / magnification lens drive path 622;

In this case, from the battery 63 to the high voltage system 60,
The power supply voltage is supplied directly from the catronics system 62, and the power supply voltage is supplied to the weak voltage system 61 from the battery 63 via the filter 64.

In the present embodiment, when the EL drive circuit 602 including the booster circuit for the electroluminescent (EL) element serving as a noise source is arranged, the booster circuit also serving as a noise source in the camera is provided. By mounting the strobe (charging) circuit 601 and the strobe (charging) circuit 601 on the same electric circuit board of the high-voltage system 60, it is possible to improve the isolation from other circuits and to take noise countermeasures against noise sources at the same time. It is possible to make it advantageous in terms of cost.

Further, as will be described later, by effectively utilizing the dead space, the size of the camera can be prevented, and the mounting space and the cost can be advantageously reduced.

FIGS. 2 to 4 show a front view, a plan view, and a rear view as external views of a camera according to an embodiment of the present invention.

This camera 10 is a camera provided with a zoom lens. As shown in FIG.
A main operation member detection switch 21 for switching a power supply of the camera, a lens barrel 22 constituting a zoom lens, a liquid crystal display unit 23 for displaying a state of the camera, a release switch 24 for executing a shooting operation, and a zoom. Zoom switches 25a and 25b for extending and retracting the lens are provided.

As shown in FIG. 2, in front of the camera, an autofocus (A)
F), an AF window 31 having a built-in sensor, a finder window 32 and a lighting window 33 for a finder described later, an AE window 34 for guiding light to an AE sensor for exposure adjustment built in the camera, A self-window 35 having a built-in light-emitting element for emitting light at the time of timer shooting is provided, and a strobe light-emitting unit 36 is provided at the upper right.

As shown in FIG. 4, on the rear side of the camera, a finder eyepiece 41 for the photographer to look into and determine a shooting scene, and beside the finder eyepiece 41 for the photographer to determine the shooting scene. An LED group 42 for lighting for transmitting photographing information even while looking into the camera, a panoramic switch 43 for switching between normal photographing and panoramic photographing,
A mode selection switch 44 is provided for changing the display mode of the liquid crystal display unit 23 and for selecting information (such as date information) to be recorded on the film at the time of shooting.

A back cover 45 which is opened and closed for loading a film is provided.

FIG. 5 is a sectional view taken along the line AA 'in FIG. 2. The battery 100 as a power supply for operation and a main condenser 101 for storing a high voltage for strobe light emission are provided on a camera exterior. A strobe board 1 which is disposed between the camera body 103 and the camera body 103, and on which a component for charging and emitting a strobe is mounted is provided on the top of the camera body.
04, the front part of the camera exterior 102 and the camera body 10
3, a control circuit 105 for controlling the camera (corresponding to the arithmetic control circuit 613 in FIG. 1) and a main board 107 on which an analog IC 106 and the like are mounted are arranged.

The control circuit 1 on the main board 107
05, a signal for controlling the charging and light emission of the strobe;
A control signal of an electroluminescence element driving circuit described later is transmitted to the flash substrate 104 by the flexible substrate 108.

In this case, relatively large-sized members such as a step-up transformer in a charging circuit and a trigger coil in a light-emitting circuit are arranged on the strobe board 108. A dead space is easily generated between the camera body 103 and the camera body 103.

In the present embodiment, however, an electroluminescence element driving circuit (FIG. 1) is provided in a dead space generated between the camera body 103 and the flash substrate 104.
Corresponding to the EL drive circuit 602).

As described above, when the dead space is not utilized, the electric components included in the electroluminescence element driving circuit are composed of electroluminescence element control ICs and coils, which are relatively large in size and layout. There is a problem in terms of space factor.

Further, the electroluminescence element driving circuit includes a booster circuit, and there is a problem that noise generated by the booster circuit adversely affects the circuit.

Therefore, in order to prevent adverse effects due to noise generated by the booster circuit of the electroluminescence element driving circuit, unnecessary laying of wiring near the liquid crystal display unit 23 as a liquid crystal display (LCD) unit is shortened as much as possible. Various measures must be taken, such as keeping them away from other circuit components and providing a shield against noise.

Further, as described above, since there are many relatively large electric components of the camera among the electric components for the strobe, as described above, as shown in FIG.
A dead space tends to occur between the camera body 04 and the camera body 103 supporting the camera body 04.

The booster circuit mounted on the flash substrate 104 is also affected by the noise generated by the booster circuit on other circuits, similarly to the booster circuit in the EL drive circuit, ie, the electroluminescence element drive circuit. Since it becomes a problem, a countermeasure is needed.

In the present embodiment, however, as shown in FIG. 6, the EL driving component is provided in the dead space between the flash substrate 104 on which the electronic component for the flash is mounted and the camera body 103. By arranging the camera in a state where the camera is mounted on the camera 104, it is possible to provide a new mounting space for arranging the EL driving parts and to avoid an increase in the size of the camera.

Further, since noise sources in the camera are collectively arranged, as shown in FIG. 6, the ground (GND) line of the booster circuit is made thicker and shared to reduce noise. By stabilizing the power supply or mounting the EL driving component on the strobe substrate 104 on which the strobe electric component is mounted and surrounding it with the shield member 120, noise countermeasures can be taken collectively.

As described above, the measures against noise are performed at one place. A step-up circuit for a strobe and a step-up circuit for driving an electroluminescent element, which are noise sources, are separately arranged, and the noise is respectively increased. This is more cost-effective than taking countermeasures, and since noise sources can be separated from other circuits at the same time, isolation from other circuits is improved.

FIG. 7 shows a control circuit 105 in the camera, the liquid crystal display section 23 and the electroluminescence sheet 10.
FIG. 9 is a diagram for explaining a movement from when the control circuit 105 sends out a signal to when the control circuit 105 actually performs an operation by adopting a configuration in which a board and the like involved in driving them are simplified. It is.

First, the control circuit 105 controls the liquid crystal display unit 23
In order to display an image and to turn on the electroluminescence sheet 109, a signal is transmitted.

The signal sent from the control circuit 105 enters the flexible substrate 108 via a connector (not shown), and goes upward of the camera body 103 (see FIG. 5).

At this time, the flexible substrate 108 is disposed in a gap between the camera exterior 102 (see FIG. 5) and the strobe substrate 104, and is connected to the strobe substrate 104, so that the operation signal of the strobe and the driving of the electroluminescence element are performed. A control signal from the circuit 110 is transmitted to the strobe substrate 104.

The electroluminescence element driving circuit 110 disposed in the strobe substrate 104 receives power supply from the flexible substrate 108 together with the driving signal, performs a boosting operation for lighting the electroluminescence sheet 109, and generates a driving signal. Then, a drive signal is applied to the flexible substrate 108 again.

The signal indicating where the liquid crystal display unit 23 is to be displayed and the signal for turning on the electroluminescent element are transmitted to the bottom of the LCD window (not shown here) provided at the upper center of the camera housing 102. The sheet is sent on the flexible substrate 108.

The camera upper LC (not shown)
A liquid crystal display unit 23 is fitted in the D window, and an electroluminescence sheet 109 is arranged on the back surface thereof.
The display on the liquid crystal display section 23 is performed, and the electroluminescence sheet 109 is turned on.

Strobe substrate 104 in the present embodiment
Is a release switch 24 for prompting the photographing operation shown in FIG.
And a zoom switch 25a for prompting the operation of the zoom lens,
25b.

To this end, the strobe substrate 104 is provided above the camera, and the display unit using an electroluminescence sheet as a light source is also disposed above the camera, so that a high-voltage electroluminescence drive signal is transmitted. It can be said that the distance over which the wiring is routed can be relatively short.

In the present embodiment, the boosted drive signal sent from the electroluminescence element drive circuit is mounted on the flexible substrate 108 again, and the signal for actually driving is sent.

This boosted drive signal has a higher voltage than a signal used for controlling a camera mounted on another flexible substrate 108 and a sufficient space cannot be provided between signal lines. , May adversely affect other signals as noise.

In this case, a configuration is also conceivable in which the boosted electroluminescence drive signal is not put on the flexible substrate 108 but the drive signal is transmitted from the strobe substrate 104 to the electroluminescence sheet 109 using a shield wire or the like.

The type of the light source in the present invention does not matter.

In the above embodiment, an electroluminescence sheet (EL sheet) is taken as an example of a light source. However, as another light source, an LED may be used as a light source and used as a backlight of an LCD.

In this case, the E arranged together with the strobe circuit
LE for backlight instead of L-sheet drive circuit
It is also conceivable to arrange a D LED drive circuit.

As described above, according to the embodiment of the present invention, the booster circuit which may adversely affect other circuits in the camera and becomes a noise source is collectively arranged in the dead space of the strobe board. I am trying to do it.

This makes it easy to separate the noise source from other circuits while effectively using the space, and collectively surrounds the noise source with a shielding material or the like as a countermeasure against noise.
This is more effective in terms of cost than taking individual noise countermeasures, and the layout of circuit components can be optimized.

Further, in the present specification described in the above-described embodiment, in addition to claims 1 to 3 described in the claims, the inventions shown below as supplementary notes 1 and 2 will be described. include.

(Supplementary Note 1) In the electric circuit board on which the first booster circuit and the second booster circuit are mounted, a noise leakage preventing means for preventing noise from leaking to other circuits is provided. The camera according to claim 1, wherein:

(Supplementary Note 2) The above-mentioned noise leakage prevention means includes:
By surrounding the periphery of the electric circuit board with a common shield member, the influence on the other circuit is suppressed, and the ground line of the first booster circuit and the second booster circuit is shared by a thick line. 2. The camera according to claim 1, wherein

[0063]

As described above, according to the present invention, since a relatively large member is mounted among the electric parts of the camera, a dead space is easily generated between the electric part of the camera and the camera body on the receiving side. A circuit for driving the liquid crystal light source is placed on the board on which the flash light emission (strobe) charging circuit is mounted. By effectively utilizing the dead space, it is possible to prevent the camera from becoming larger and to generate noise in the camera. Can provide a camera capable of simultaneously moving a noise source away from other circuits.

That is, according to the present invention, a charging circuit including a first booster circuit for storing flash light emission energy for flash light emission as a noise source, and a display unit such as a liquid crystal display for displaying photographing information of a camera, for example. In the camera having the second step-up circuit for preventing the size of the camera from being increased, the mounting space and the cost are advantageous, and at the same time,
A camera can be provided in which a noise source can be kept away from other circuits.

[Brief description of the drawings]

FIG. 1 is a conceptual block diagram showing a simplified configuration of an embodiment of a camera according to the present invention.

FIG. 2 is a front view showing an appearance of a camera according to an embodiment of the present invention.

FIG. 3 is a plan view illustrating an appearance of a camera according to an embodiment of the present invention. And a rear view.

FIG. 4 is a rear view showing the appearance of the camera according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along arrows AA ′ in FIG. 2;

FIG. 6 is a diagram illustrating a configuration in which noise sources in a camera are collectively arranged, and a ground (GND) line of a booster circuit is thickened and shared for noise suppression, thereby stabilizing power supply. FIG. 4 is a diagram illustrating an example of a configuration in which an EL driving component is mounted on a strobe substrate 104 on which a strobe electric component is mounted and is surrounded by a shield member 120 to take measures against noise collectively.

FIG. 7 shows a control circuit 105 in the camera, a liquid crystal display unit 23, and an electroluminescence sheet 109.
By adopting a simplified configuration of a board and the like involved in driving them, the control circuit 105 sends out a signal, and is a diagram shown to explain the operation until the operation is actually performed. is there.

[Explanation of symbols]

601: Flashlight strobe (charge) circuit including a booster circuit serving as a noise source; 602: Electroluminescence (E) serving as a noise source
L) EL drive circuit including a booster circuit for the element, 60: high voltage system, 611: distance measuring circuit, 612: photometric circuit, 613: arithmetic control circuit (CPU), 61: low voltage system, 621: film feeding Circuit: 622: photography / magnification lens drive path, 62: mechatronics system, 63: battery, 64: filter, 10: camera, 21: main operation member detection switch for switching camera power, 22: zoom lens 23: a liquid crystal display unit for displaying the state of the camera, 24: a release switch for executing a shooting operation, 25a, 25b: a zoom switch for extending and retracting a zoom lens, 31: for auto focus ( AF) 32 built-in AF window with built-in sensor, 32 finder window for finder, 33 lighting window, 34 built-in AE window for guiding light to the E sensor, 35: self-timer with a built-in light-emitting element that emits light during self-timer shooting, 36 ... strobe light-emitting unit, 41 ... viewfinder eyepiece for determining the shooting scene, 42 ... shooting information 43: Panorama switch for switching between normal shooting and panorama shooting, 44: Mode selection switch, 45: Back lid that opens and closes for loading film, 100: Battery, 101: Flash emission A main capacitor for storing a high voltage for the camera; 102, a camera exterior; 103, a camera body; 104, a strobe board on which electric components for a strobe are mounted; 105, a control circuit (corresponding to the arithmetic and control circuit 613 in FIG. 1). , 106: an analog IC 107: a main board on which a control circuit, an analog IC, etc. are mounted; Bull substrate, 109 ... electroluminescent sheet Ichito, 120 ... shield material.

Claims (3)

[Claims] 1. A flash light emitting section for performing flash light emission, and a first light emitting section for storing flash light emission energy for the flash light emission.
A charging circuit including the boosting circuit of (a), a second boosting circuit different from the first boosting circuit, and an electric circuit board on which a flash light emitting electric component for flash light emission is mounted. A camera comprising a first booster circuit and the second booster circuit mounted on the electric circuit board. A display unit for displaying photographing information of the camera; and a display unit including a light source unit for illuminating the display unit, wherein the second booster circuit drives the light source unit of the display unit. 2. The booster circuit according to claim 1, wherein
The described camera. 3. The display unit according to claim 1, wherein the light source unit is an electroluminescent element.
The described camera.