JPH0279675A - Electronic camera - Google Patents

Abstract

PURPOSE:To improve assembling workability on an optical system chassis and to attain miniaturization and space saving by unifying a prism, an image pickup element, and a shutter with a prism supporting member. CONSTITUTION:A pair of right and left prism supporting members 6 and 7 are mounted on both sides of the prism 1. On those supporting members 6 and 7, a pair of right and left Y-side supporting metal fittings 9 and 10 to support a Y-CCD 4 and a mechanical shutter 8 for luminance signal and a pair of right and left C-side supporting metal fittings 11 and 12 to support a C-CCD and the mechanical shutter for chrominance signal are mounted. The image pickup element and the shutter are mounted on the supporting members 6 and 7, then, those members are made into a unit. In such a way, the image pickup element and the shutter are set at the optical system chassis resultantly by mounting the prism supporting member on the optical system chassis, and also, it is possible to suppress resist deviation due to temperature change.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention decomposes the light incident through a lens using a prism, guides each of the decomposed optical paths to separate image sensors, and performs signal processing independently. This invention relates to an electronic camera designed to improve high resolution and color reproducibility.

[Summary of the Invention] The present invention provides an electronic camera in which incident light is decomposed by a prism and the decomposed light is guided to a plurality of image pickup devices such as a first image pickup device, a second image pickup device, etc. The plurality of image sensors are attached to a prism support member supporting a prism, and the prism support member includes:
By supporting a shutter disposed between the image sensor and the prism, the prism, the image sensor,
The shutter is unitized (integrated) with a prism support member to improve the workability of assembling it into the optical system chassis.
The structure of the optical system chassis is simplified, making it possible to reduce the size and save space.

[Prior Art] In order to improve the image quality of electronic cameras, a prism lot is used as shown in FIG. Y) as a signal to the first image sensor 102, and the other optical path as a color (C) signal.
It is guided to the second image sensor 103 as a signal, and these first . An electronic camera (two-plate electronic camera) is known in which high resolution and improved color reproducibility are achieved by performing independent signal processing in second image pickup elements 102 and 103, respectively.

Reference numeral 104 denotes a shutter (mechanical shutter) disposed in front of the incident surface (in the incident direction) of the prism lot.

[Problems to be Solved by the Invention] By the way, a shutter 104 is arranged on the entrance surface side of the conventional prism 101, and a first shutter 104 is arranged on the exit surface side of the prism 101.
The electronic camera in which the second image pickup elements 102 and 103 are arranged is
The shutter 104 and the first. Since the distance (interval) between the second image pickup elements 102 and 103 becomes large, there is a drawback that so-called shutter efficiency decreases when the shutter is released at high speed. (It is also possible to use an electronic shutter, but in that case, only field recording is possible, and the advantage of still image frame recording, which is a feature of electronic (still) cameras, cannot be taken advantage of.)

In order to solve the above conventional drawbacks, as shown in FIG.
1st. Using the second two Nyatta 105, 106,
The first shutter 105 is arranged between the first imaging element 102 and the prism 101, and the second shutter 106 is arranged between the second imaging element 103 and the prism +01,
It is conceivable to attach these first and second shutters 105 and 106 to the exit surface of the prism 101 by adhesive, or to attach them to a shutter support provided on the optical system yarn, but there are several ways to attach them. Each has the following problems.

(+) The former method of attaching the shutter to the exit surface of the prism 101 is because the shutter is relatively heavy (in particular,
(If the shutter and the image sensor are integrally combined, the weight will increase), and the bonding area is too small to be bonded effectively using only the exit surface of the prism. (The exit surface of the prism must be made large to ensure reliable adhesion).

(2) The latter method, in which a shutter support part is provided on the optical system chassis and the shutter is attached to the core part, is superior in terms of strength because the optical system chassis is generally made of aluminum die-casting, etc., but the so-called Warm special: Resistance slippage is likely to occur,
Furthermore, the structure of the optical system chassis became complicated, and the workability of assembling the shutter of the optical system chassis was poor.

The present invention solves the above-mentioned conventional problems by attaching a shutter and an image sensor to a prism support member.

[Means for Solving the Problems] In an electronic camera in which light incident through a lens is separated by a prism and guided to a plurality of image sensors, the prism is attached to a prism support member, and the prism support member is provided with: At the same time as the image pickup device was attached, mechanical shutters were placed between the image pickup device and the prism and supported by the prism support member.

[Function] The image sensor and shutter are attached to the prism support member to which the prism is attached, and these are made into a unit.If the prism support member is attached to the optical system frame, the image sensor and shutter can also be attached to the optical system frame automatically. This also suppresses misregistration due to temperature changes.

[Example] Next, the present invention will be explained with reference to FIGS. 1 to 3.

In Fig. 1, l is a prism configured for a two-plate electronic still camera, and this prism l separates the optical path of the light incident from the entrance surface 2 into two, and uses the - side as a luminance (Y) signal. A signal output surface 3 (hereinafter referred to as C-exit surface) emits light to a luminance signal imaging device (referred to as Y-COD) 4, and the other side is used as a color (C,) signal to a color signal output surface (hereinafter referred to as Y-exit surface). The light is emitted from 5 to a color signal image sensor (hereinafter referred to as C-CC0), which is not shown.

On both sides of the prism l, a pair of left and right prism support members (prism bases) 6°7 made of ceramic having approximately the same coefficient of linear expansion as the prism l are used to attach the prism to an optical system soybean (not shown). are attached to these prism support members 6.7, and a pair of left and right Y-side support fittings 9.1 for supporting the Y-'CCD 4 and a mechanical shutter for luminance signals (hereinafter referred to as Y-shutter) 8.
A pair of left and right C-side support fittings 11 and 12 are attached to support color signal mechanical shutters (hereinafter referred to as C-shutters) such as C-C0D and C-C0D.

The Y rigid support fitting 9.10 is formed into an L-shape by a base portion (a mounting surface to a prism support member) 13 and a support portion (to which a shutter or COD is attached) 14.

One Y rigid support metal fitting IO is provided with reference pins 16.1 provided in the one prism support member 7 in pin holes 15.15 provided at both ends of the base portion 13 in the length direction (vertical direction).
6 is inserted and positioned, the center 1M≦ of the base portion 13 is screwed to one prism support member 7 by one screw I7, and the support portion 14 is attached to the prism 1.
It is located at a position that is slightly more protruding than the Y-output surface 3. The other Y-side support fitting 9 is assembled by inserting reference pins (not shown) provided on the other prism support member 6 into the pin holes 15 provided at both longitudinal ends of the base portion 13 and positioning them. Book screw 18 and coil spring 1
The center portion of the base portion I3 is screwed to the other prism support member 7 with the torque being regulated by 9. (The reason why the pair of left and right Y-side support fittings 9.lO is attached to the prism support member 6.7 in the above-described manner is to cope with thermal deformation due to thermal expansion).

These pair of left and right Y side support fittings 9. The Y-shutter 8 is mounted and supported by 10 supporting members 14.14 in a state facing the Y-output surface 3.

Y-Nyatta 8 connects screws 21...2 via connecting member 20.
1, it is integrally connected to the Y-CCD 4 in advance, and is integrated (unitized) as a Y-shutter CCD block 22.

In these integrated Y-shutter CCD blocks 22, the prism support members 6.7 are attached to the prism l as described above, and the Y-side support metal fittings 9.7 are attached to the prism support members 6, 7. After the prism assembly 23 configured by attaching the IO and C side support fittings 11.12 is attached to an optical system chassis (not shown), it is supported by the support members 14.14 of the Y rigid support fitting 9.10. It looks like this.

Next, the structure for attaching the Y-chassis CCD block 22 to the Y-side support fittings 9.10 will be described.

The vertical direction of the support part 14 of one Y rigid support metal fitting IO (
A pair of upper and lower block supporting screws 24, 24 are implanted at both ends (in the length direction), and one block supporting screw 24 is installed in the supporting portion I4 of the other Y side support fitting 9.
has been planted.

On the other hand, the three screws 24 are attached to the Y shutter 8.
- Screw receiving holes 25...25 for loosely fitting these screws are formed at positions corresponding to 24.

Then, after first screwing the adjustment nuts 26 onto the block supporting screws 24...24, these screws 24...
・By inserting the screw receiving holes 25...25 into 24, the Y-shutter 8 is made to face the Y-output surface 3 of the prism (■) with a predetermined interval, and the Y-shutter C is opened.
The CD block 22 is attached to the support part 14 of the Y side support fitting 9.10.
．． 14, and then a coil spring 27 is inserted into the distal end side of the block supporting screws 24, and then a clamp nut 28 is screwed together.

Then, with the adjustment nut 24, focus adjustment, tilt adjustment, etc.
After adjusting the registration, tighten the clamp nut 28 and attach the Y-shutter CCD block 22 to the Y-side support fitting 9. All you have to do is lock it to the support part 14°14 of the IO.

In addition, the support part of the C side support fitting 11.12! 4.14 is C-
Although a shutter CCD block (not shown) is attached, the structure of the C-shutter CCD block and its attachment method are substantially the same as those of the Y-shutter CCD block, so a description thereof will be omitted.

The reason why the shutter and COD are integrated and attached to the support member (supporting metal fittings) is to improve the ease of assembly to the support member and to stabilize and improve positional accuracy. There is no need to integrate COD and COD.

Furthermore, although the embodiment shown in the drawings shows a case in which the shutter is screwed to the support metal fitting, the connecting member 20 that connects the shutter and the COD may be made larger and the connecting member 20 may be screwed to the support metal fitting.

In addition, the Y side and C side support fittings 9 to the prism support member 6.7
．． 1O111, 12 mounting structure, these Y side, C side support metal fittings9. The structure for attaching the shutter COD block to l0111.12 is not limited to that of the embodiment.

Furthermore, although the embodiment shown in the drawings has been described using a two-panel electronic still camera as an example, the present invention can also be applied to a three-panel electronic still camera.

[Effects of the Invention] As explained above, the present invention includes attaching a prism to a prism support member, attaching an image sensor to the prism support member, and disposing a shutter between the image sensor and the prism. Since the shutter is supported by the prism support member, the following effects can be obtained.

(1) Since the shutter is placed just in front of the imaging probe, it is possible to prevent a decrease in shutter efficiency even when the shutter is released at high speed.

(2) Since the shutter and COD are attached to the prism support member, even if the shutter and COD are somewhat shaped, they can be supported reliably and stably.

(3) Since the prism support member is generally made of ceramic having substantially the same coefficient of linear expansion as the prism, it is possible to suppress misregistration due to temperature changes.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the main parts of the electronic camera of the present invention, and FIG.
FIG. 3 is a side view, FIG. 3 is a rear view, FIG. 4 is an explanatory diagram of a conventional example, and FIG. 5 is an explanatory diagram showing a case where the shutter is placed immediately before the COD. l... Prism, 4... Image pickup element, 6.7... Prism support member, 8... Shutter. Figure 4 Figure 5 A-plane view of the main part Figure 2 One-sided view of Yu 1W Figure 3

Claims (1)

[Claims] (1) In an electronic camera in which light incident through a lens is separated by a prism and guided to a plurality of image pickup devices, the prism is attached to a prism support member, the image pickup device is attached to the prism support member, and An electronic camera characterized in that a shutter is disposed between an image sensor and a prism, and is supported by a prism support member.