JP4624256B2 - Electrical equipment for selectively arranging translucent bodies - Google Patents

Description

The present invention relates to an electrical device that selectively arranges a translucent body, and more particularly to a monitoring camera that selectively arranges an infrared cut filter and a dummy glass piece on a lens optical axis.

Many such surveillance cameras use a CCD as a solid-state imaging device. The sensitivity characteristic of the CCD extends to a wavelength region of about 400 nm to 1000 nm, and particularly sensitivity in the infrared region (about 700 nm or more) is high. Therefore, when light from an external subject is directly incident on the CCD, the color image output from the CCD becomes reddish. Therefore, an infrared cut filter for removing light in the infrared region is inserted between the lens and the CCD to remove the redness.
Further, since the amount of light is large during the daytime, a good color output can be obtained from the CCD. However, since the amount of light is small at night, a good color output cannot be obtained. Therefore, in order to increase the amount of light input to the CCD at night, an infrared cut filter is not used, and light including an infrared region is input to the CCD to obtain a good image.
In the surveillance camera, in consideration of such CCD characteristics, an infrared cut filter is inserted between the lens and the CCD when the CCD output level is large (the amount of light is large such as daytime), and the CCD output level is low (nighttime). There has been proposed a surveillance camera that automatically inserts a dummy glass piece in place of the infrared cut filter when the amount of light is small.

FIG. 7 is a block diagram showing a conventional surveillance camera. In the camera cabinet (2), the lens (5), the CCD (4), and an infrared cut filter (7) that is selectively inserted into a space K between the lens (5) and the CCD (4). ) Or a dummy glass piece (70), and the motor (M) is driven to move the infrared cut filter (7) and the dummy glass piece (70) in a direction perpendicular to the lens optical axis L (arrow X direction in FIG. 7). And a slide mechanism (20).
The infrared cut filter (7) and the dummy glass piece (70) are connected to each other in a plane orthogonal to the lens optical axis L and arranged side by side. Either the infrared cut filter (7) or the dummy glass piece (70) is inserted into the space K, and the other is removed from the space K.
Among the light incident through the lens (5), the wavelength component in the infrared region (about 700 nm or more) is removed by the infrared cut filter (7). The CCD (4) converts light incident through the infrared cut filter (7) or the dummy glass piece (70) into an electrical signal.

  FIG. 8 is a perspective view showing details of the slide mechanism (20) (see Patent Document 1). The slide mechanism (20) is composed of a connecting arm (22) that rotates together with the motor (M), an infrared cut filter (7), and a dummy glass piece (70) and is connected to the connecting arm (22). A holder (25) and a support plate (26) for guiding the slide of the holder (25) are provided. The support plate (26) is provided with a through hole (27) that allows light from the lens (5) to the CCD (4). When the motor (M) rotates, the holder (25) slides through the connecting arm (22), and the infrared cut filter (7) or the dummy glass piece (70) selectively opposes the through hole (27). Light that has passed through the infrared cut filter (7) or the dummy glass piece (70) enters the CCD (4).

JP 2003-348399 A

As is well known, the CCD (4) obtains a video signal by arranging a large number of pixels on a light receiving surface and two-dimensionally sampling a subject image having spatial frequency characteristics. However, when the spatial frequency is equal to or higher than half the sampling frequency (Nyquist frequency), a false signal called moire is generated. As a countermeasure, an optical low-pass filter is interposed between the lens (5) and the infrared cut filter (7) or the dummy glass piece (70) in order to prevent the moire by limiting the spatial frequency of the subject image to the Nyquist frequency or lower. May be inserted.
However, in the surveillance camera, the space K is narrow, and in the space K, it may not be possible to provide a large gap between the optical low-pass filter and the infrared cut filter (7) or the dummy glass piece (70). On the other hand, if the gap is not ensured accurately, the optical low-pass filter may come into contact with the infrared cut filter (7) or the dummy glass piece (70) that slides and may be damaged.
Conventionally, the infrared cut filter (7) and the dummy glass piece (70) are bonded to the holder (25) with an adhesive. However, there is a problem that it takes time until the adhesive is cured, and adhesion workability is poor.
An object of the present invention is to efficiently deploy a first translucent body that is fixedly deployed and a holder that slides in a direction that faces the first translucent body and that is orthogonal to the facing direction in a narrow space. is there. Another object of the present invention is to eliminate the need for fixing the translucent member to the holder.

In the chassis (1), there are provided a first translucent body that is fixedly arranged and a resin holder (3) that slides in a direction substantially perpendicular to the translucent direction of the first translucent body. The translucent body is held on the chassis (1) by a cover (6) formed of a metal plate, and the holder (3) is in contact with the upper surface of the cover (6), so that the holder (3) and the first translucent light are transmitted. A gap corresponding to at least the thickness of the cover (6) is secured between the bodies, and both ends of the cover (6) along the sliding direction of the holder (3) are bent to the opposite side of the holder (3).
Further, on the holder (3), there are a second light transmitting body and a third light transmitting body that are selectively provided at locations facing the first light transmitting body by sliding the holder (3). A thin cover piece (35) covering the second light transmitting body and the third light transmitting body is attached to the holder (3).

1. The cover (6) that holds the first light transmitting body secures at least a gap corresponding to the thickness of the cover (6) between the holder (3) and the first light transmitting body. Thereby, a 1st translucent body and a holder (3) can be efficiently arrange | positioned in a narrow space, without mutually contacting. Further, since the cover (6) is made of a metal plate and the holder (3) is made of synthetic resin, the sliding friction of the holder (3) with respect to the cover (6) is reduced, and the holder (3) slides smoothly. Can move. In addition, since both ends of the cover (6) along the sliding direction of the holder (3) are bent on the opposite side of the holder (3), the holder (3) has an R surface by bending a metal plate. This also allows the holder (3) to slide smoothly.
2. Since the second light transmitting body and the third light transmitting body are not bonded but are attached to the holder (3) by the thin cover piece (35), there is no complexity in the bonding work. Further, the covering piece (35) is thin, and the holder (3) can be arranged in a narrow space.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a chassis (1) provided in a surveillance camera, and FIG. 2 is a front view of FIG. As will be described later, an infrared cut filter (7) and a dummy glass piece (70) are slidably disposed in the chassis (1). A hollow rectangular tube (10) protrudes from the chassis (1), and an opening (14) in which the CCD (4) is disposed is formed on the upper surface of the rectangular tube (10). The rectangular tube (10) has a configuration in which substantially parallel wall pieces (11) and (11) attached to a substrate (40) for the CCD (4) are connected by a bridge piece (12). The lens (5) is slidably disposed along the optical axis on the lower surface of the chassis (1) on the opposite side of the square tube (10), but the lens (5) is slid along the optical axis. The mechanism to make it not shown. The image from the lens (5) is focused on the CCD (4) through the infrared cut filter (7) or the dummy glass piece (70) as in the conventional case.

  A first lid (8) covers the left end of the chassis (1), and a mechanism for sliding the infrared cut filter (7) and the dummy glass piece (70) inside the first lid (8) is provided. The first lid (8) protects the slide mechanism and also serves as a light shield for the infrared cut filter (7) and the dummy glass piece (70). A motor (M) for driving a mechanism for sliding the infrared cut filter (7) and the dummy glass piece (70) is attached to the lower surface of the chassis (1) on the opposite side of the first lid (8). Yes.

3 (a) and 3 (b) are plan views of the chassis (1) with the first lid (8) removed. A gear train (21) connected to the motor (M) is provided at the left end of the chassis (1), and the gear train (21) is connected to the holder (3) via the connection arm (22). The holder (3) is provided so as to be slidable left and right within a plane orthogonal to the optical axis of the lens. An infrared cut filter (7) and a dummy glass piece (70) as a translucent body are placed horizontally on the holder (3). They are deployed side by side. The infrared cut filter (7) and the dummy glass piece (70) selectively face the opening (14) as the holder (3) slides. FIG. 3 (a) shows an infrared cut filter (7), and FIG. 3 (b) shows a state in which a dummy glass piece (70) faces the opening (14).
A detected element (34) protrudes from the left end portion of the holder (3), and the detected element (34) passes through a long hole (80) formed in the first cover (8), and the first cover (8). Jump out of the outside. Even if the first lid (8) covers the chassis (1), either the infrared cut filter (7) or the dummy glass piece (70) faces the opening (14), depending on the left and right positions of the detector (34). You can see if

  FIG. 4 is an exploded perspective view of the chassis (1) and the holder (3). A side hole (13) is opened on the side surface of the rectangular tube (10) of the chassis (1) and below the bridge piece (12) (see FIG. 6), and the holder (3) is connected to the side hole (13 ) Slide through. An optical low-pass filter (75), which is a translucent material, is provided below the holder (3). The optical low-pass filter (75) is a chassis formed by a cover (6) formed by bending a metal plate. It is pressed by (1). The cover (6) has an upper plate (60) that faces the lower surface of the holder (3), and a side plate that is located on both ends along the sliding direction of the holder (3) and is bent to the opposite side of the holder (3) ( 61) It has (61).

FIG. 5 is a cross-sectional view of the holder (3), the optical low-pass filter (75), and the cover (6) taken along the line AA in FIG. In the cover (6), the side plates (61) and (61) are fitted in the side holes (13), and the upper plate (60) is in contact with the lower surface of the holder (3). Due to the contact between the upper plate (60) and the lower surface of the holder (3), the holder (3) and the optical low-pass filter (75) have a gap of at least the thickness of the upper plate (60), specifically 0.1 mm. Vacant.
Thereby, the optical low-pass filter (75) and the holder (3) can be efficiently arranged in a narrow space without contacting each other. Further, since the cover (6) is made of a metal plate and the holder (3) is made of synthetic resin, the sliding friction of the holder (3) against the cover (6) is reduced, and the holder (3) slides smoothly. Can move. In addition, since the side plates (61) and (61) of the cover (6) are bent on the side opposite to the holder (3), the holder (3) hits the R surface by bending of the metal plate, This also allows the holder (3) to slide smoothly.

  The holder (3) has a first through hole (30) and a second through hole (31) having a stepped portion (32), and an infrared cut filter (7) is provided in the first through hole (30). The dummy glass piece (70) fits in the two through holes (31). The holder (3) is attached with an infrared cut filter (7) or a thin film-like cover piece (35) covering the dummy glass piece (70), and the infrared cut filter (7) and dummy glass of the cover piece (35). A hole (36) is opened at a location facing the piece (70). The covering piece (35) prevents the infrared cut filter (7) or the dummy glass piece (70) from coming off the holder (3). That is, since the infrared cut filter (7) or the dummy glass piece (70) is not bonded but attached to the holder (3) by the thin cover piece (35), there is no complexity in the bonding work. Further, the covering piece (35) is thin, and the holder (3) can be arranged in a narrow space.

As shown in FIG. 4, a second lid (9) covering the holder (3) is fitted into the side hole (13) from the side of the square tube (10). Protrusions (90) (90) are provided at the end of the second lid (9) inserted into the side holes (13), and the protrusions (90) (90) are fitting holes formed in the chassis (1). (15) Fits into (15). The second lid (9) regulates the upper and lower backlash of the holder (3) and secures a clearance for the holder (3) to slide. The second lid (9) also serves to shield the infrared cut filter (7) and the dummy glass piece (70).
Since the square tube (10) has a side hole (13), the strength may be reduced. Therefore, a bridge piece (12) is provided between the wall pieces (11) and (11) to prevent a decrease in strength.

  In the monitoring camera of this example, the optical low-pass filter (75) is exemplified as the first light transmitting body, and the infrared cut filter (7) and the second light transmitting body and the third light transmitting body are exemplified. Although the dummy glass piece (70) is shown, the type of the transparent body is not limited to this. Further, the technical idea of this example is not limited to the surveillance camera, but can be applied to an electric device having another light transmitting body.

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

It is a perspective view of the chassis arrange | positioned in the camera for surveillance. It is a front view of FIG. (a), (b) is a plan view of the chassis with the first lid removed, (a) shows an infrared cut filter, and (b) shows a state where a dummy glass piece faces the opening. Yes. It is a disassembled perspective view of a chassis and a holder. It is sectional drawing which fractured | ruptured the holder, the optical low-pass filter, and the cover in the surface containing the AA line of FIG. It is sectional drawing of a square tube. It is a block diagram which shows the conventional monitoring camera. It is a perspective view which shows the detail of the conventional slide mechanism.

Explanation of symbols

(1) Chassis
(3) Holder
(6) Cover
(7) Infrared cut filter
(35) Cover
(70) Dummy glass piece
(75) Optical low-pass filter

Claims (4)

A first light-transmitting body fixedly arranged in the chassis (1) and a resin holder (3) that slides in a direction substantially perpendicular to the light-transmitting direction of the first light-transmitting body are provided. The light body is held on the chassis (1) by a cover (6) formed of a metal plate, the holder (3) is in contact with the upper surface of the cover (6), and the holder (3) and the first light transmitting body. A gap corresponding to at least the thickness of the cover (6) is secured, and both ends of the cover (6) along the sliding direction of the holder (3) are bent to the opposite side of the holder (3). Features electrical equipment. On the holder (3), a second translucent body and a third translucent body, which are selectively disposed at a position facing the first translucent body by sliding of the holder (3), are provided. The electric device according to claim 1, wherein the holder (3) is provided with a second light-transmitting body and a thin covering piece (35) covering the third light-transmitting body. The holder (3) is slidably fitted into the side hole (13) established in the chassis (1), and a lid body for restricting the upper and lower backlash of the holder (3) is inserted into the side hole (13). The electrical device according to claim 1 or 2. The first light transmitting body is an optical low-pass filter (75), and the second light transmitting body and the third light transmitting body are an infrared cut filter (7) and a dummy glass piece (70), respectively. Or the electric equipment of 3.

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