JPH0732648U - Dew condensation removal device in camera - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a dew condensation removing device for a camera which can quickly remove dew condensation generated in an optical system such as a viewfinder and a photographing lens. A dew condensation removing device for a camera according to the present invention is configured such that the dew condensation generated inside the camera of an optical system such as a viewfinder and a photographing lens of the camera is generated inside the camera by the air supply means. It is characterized in that it is removed by blowing outside air.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a camera that can quickly remove dew condensation that occurs on the inside surface of a camera such as an optical system such as a viewfinder and a taking lens of the camera.

[0002]

[Prior art]

 A camera is usually carried and photographed at a constant temperature (temperature). Therefore, the optical system such as the finder and the photographing lens can perform desired photographing without being affected by the temperature change.

[0003]

[Problems to be solved by the device]

 However, due to the diversification of leisure in recent years, photography has been performed under various temperatures. For example, there are cases where a photograph is taken indoors after being photographed at a ski resort. In this way, when the camera is moved from a low temperature place to a high temperature place, dew condensation (so-called clouding) occurs on the camera. When this dew condensation occurs on the optical system such as the viewfinder and taking lens, the photographed image is directly affected by the dew condensation. That is, when dew condensation occurs on the finder, a desired photographing range cannot be defined, and when dew condensation occurs on the photographing lens, a desired photographed image cannot be obtained. If condensation forms on the side of the optical system that faces the outside of the camera, it can be removed by wiping it with a cloth or the like. However, if dew condensation occurs on the side of the optical system that faces the inside of the camera, it cannot be wiped off and there is no choice but to wait for the dew condensation to be naturally removed. Therefore, it is not possible to take a picture until the dew condensation disappears, and a photo opportunity may be missed.

[0004]

[The purpose of the device]

 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dew condensation removing device for a camera, which can quickly remove dew condensation generated in an optical system such as a finder or a photographing lens. Is.

[0005]

[Means for solving the problem]

 In order to solve the above-mentioned problems and to achieve the object, the dew condensation device in a camera according to the present invention is, according to the description of claim 1, provided inside a camera of an optical system such as a viewfinder and a taking lens of the camera. It is characterized in that the formed dew condensation is removed by blowing outside air into the camera inside the optical system where dew condensation has occurred by the air supply means.

According to a second aspect of the present invention, there is provided a dew condensation removing device for removing the dew condensation that is generated inside the camera of an optical system such as a finder and a photographing lens of the camera. And a camera body having an insertion hole for inserting the inside and the outside of the camera, and a pipe for connecting the supplied outside air to the inside of the camera of the optical system, which is connected to the insertion hole from the inside of the camera. It is characterized in that it is provided with a passage and an air supply means for supplying outside air to this pipeline.

According to a third aspect of the present invention, the dew condensation removing device in a camera further comprises a water droplet intrusion preventing means for preventing intrusion of water droplets from the outside into the camera.

[0008]

【Example】

 The configuration of an embodiment of the dew condensation removing device in a camera according to the present invention will be described in detail below with reference to FIGS. 1 and 2.

The camera 100 shown in FIGS. 1 and 2 is connected from the camera inside 100 a side so as to communicate with the camera body 104 having an insertion hole 102 for inserting the inside 100 a of the camera and the outside. It is provided with a tube 110 as a conduit for guiding the outside air supplied from a blower 112 as an air supply means to the side of the optical system such as the finder 106 and the taking lens group 108 facing the inside 100a of the camera. And

The camera 100 is a camera having an automatic focusing function, and includes a photographing lens group 108 arranged on the front surface of the camera body 104, and a finder 106 arranged above the photographing lens group 108 for defining a photographing range. A distance measuring unit (not shown) provided on the side of the finder 106 and having a lens for emitting infrared rays and a lens for receiving light for measuring the distance from the camera 100 to the subject, and this distance measuring unit. A battery as a power source for driving a taking lens group 108 that is moved forward and backward by a predetermined amount based on the value measured by the distance, and a not shown shutter mechanism and a lens driving mechanism (not shown) that extends the taking lens group 108. A battery storage chamber 126 for storing the battery and a voltage boosted by a booster circuit are charged to light a strobe (not shown). It further comprises a condenser 128 for storing, a back cover 124 which is openably and closably attached to the camera body 104 for loading and unloading a film, a cartridge chamber 132, and a film winding chamber 130.

The periphery of the insertion hole 102 provided in the camera body 104 has a shape that is recessed by a predetermined amount toward the inside 100 a of the camera. That is, a concave portion 102a having a concave shape when viewed from the outside of the camera body 104 and a convex portion 102b having a convex shape when viewed from the inside 100a of the camera are formed around the insertion hole 102. . The tip of an outside air outlet 112c of a blower 112, which will be described later, can be fitted in close contact with the recess 102a.

As shown in FIG. 3, a tube mounting portion 102c for mounting the tube 110 is provided on the convex portion 102b on the camera inner side 100a side so as to surround the insertion hole 102 and project upward by a predetermined amount. . The insertion hole 102 communicates with the tube 110 by tightly fitting the tube 110 to the tube mounting portion 102c. Unlike the inner diameter 122a at the inlet of the tube 110 on the side where the tube is mounted on the tube mounting portion 102c and the inner diameter 122b at the center of the tube 110, a step 120 is formed.

The tube mounting portion 102c has a diameter larger than the inner diameter 122a of the inlet of the tube 110, and when the inner diameter 122a of the inlet of the tube 110 is closely fitted to the tube mounting portion 102c, The tube 110 is mounted on the tube mounting portion 102c. Therefore, as will be described later, the outside air supplied from the blower 112 to the tube 110 via the insertion hole 102 does not leak from this mounting location. A ventilation / water impermeable filter 118, which will be described later as a means for preventing water droplets from entering, is sandwiched between the upper end of the tube mounting portion 102c in FIG. 3 and the step 120.

The other end of the tube 110 mounted on the tube mounting portion 102c is branched into a plurality of tubes 110a, 110b, 110c on the way. Nozzles 114a, 114b and 114c are attached to the tips of the branched tubes 110a, 110b and 110c, respectively. Therefore, the outside air supplied to the tube 110 by the blower 112 is blown from the nozzles 114a, 114b, 114c through the branched tubes 110a, 110b, 110c. The shape of the nozzles 114a, 114b, 114c becomes thin as it approaches the tip of the outlet 115, and by mounting this nozzle at a predetermined position inside the camera 100a, the side of the optical system facing the inside 100a of the camera can be removed. The outside air can be blown to almost the entire area.

For example, in the case shown in one embodiment, the nozzles 114a and 114b are provided with outside air blown from the nozzles 114a and 114b in order to remove the dew condensation that occurs on the side of the finder 106 facing the inside 100a of the camera. Is mounted at a predetermined position inside the camera 100a so as to cover substantially the entire area of the finder 106 facing the inside 100a of the camera. In addition, the nozzle 114c is a side on which the outside air blown from the nozzle 114c faces the camera inside 100a of the taking lens group 108 in order to remove the dew condensation that occurs on the side of the taking lens group 108 facing the inside camera 100a. It is mounted at a predetermined position inside the camera 100a so as to cover almost the entire area of.

The mounting of each nozzle 114a, 114b, 114c at a predetermined position inside the camera 100a is performed by, for example, forming a clip portion 117 formed integrally with each nozzle 114a, 114b, 114c so as to be engaged therewith. An engaging hole is provided at a predetermined position inside the camera 100a, and the clip portion 117 is engaged. Since the tubes 110a, 110b, 110c are arranged along the inner surface of the camera body 104 as shown in FIG. 2, the shooting lens group 108 and the tubes 110a, 110b, 110c are extended by moving the shooting lens group 108 out. It does not interfere with 110a, 110b, 110c.

The blower 112 for supplying the outside air to the tube 110 is formed of an elastic member and has a dropper-like shape, and includes a first outside air storage chamber 112a for storing the outside air and the first outside air storage chamber 112a. It is provided with a first outside air introduction hole 112b for introducing outside air into the outside air storage chamber 112a and an outside air outlet 112c for sending out the outside air introduced into the first outside air storage chamber 112a.

After the outside air outlet 112c of the blower 112 is closely fitted into the recess 102a formed around the outside of the camera body 104 of the insertion hole 102, the first outside air storage chamber 112a is touched with a finger or the like. When it is sandwiched by and elastically deformed, the outside air stored in the first outside air storage chamber 112a is sent out via the outside air outlet 112c. The elastically deformed first outside air storage chamber 112a tries to return to its original shape by loosening the force of the pinched fingers. At this time, the outside air is introduced into the first outside air storage chamber 112a from the first outside air introduction hole 112b. The first outside air introduction hole 112b is provided with a valve (not shown) that regulates the supply direction of outside air to one direction.

The tip of the outside air delivery port 112 c of the blower 112 has a shape that fits closely into the recess 102 a of the insertion hole 102. Therefore, all the outside air sent out by the blower 112 is supplied to the tube 110 without leaking from this fitting portion.

As described above, the outside air is blown by the blower 112 through the insertion hole 102, the tube 110, and the nozzle 114 to the side of the optical system that faces the inside 100a of the camera. In this case, if there are water drops, dust, etc. near the insertion hole 102, the water drops, dust, etc. will be blown into the camera interior 100a by blowing air.

Therefore, in the camera 100 according to the embodiment, a ventilation / water-impermeable filter 118 that does not allow water droplets or dust to pass but only outside air (gas) to pass between the tube 110 and the tube mounting portion 102c. And removes water drops and dust from the outside air supplied to the inside 100a of the camera. Therefore, the air blown from the blower 112 prevents water droplets from entering the inside 100a of the camera.

The dew condensation on the side of the optical system facing the camera interior 100a by the dew condensation removing device in the camera according to the embodiment configured as described above is removed as follows.

When dew condensation occurs on the optical system of the camera, for example, on the side of the taking lens group 108 that faces the camera interior 100 a, first, the tip of the outside air outlet 112 c of the blower 112 is recessed around the insertion hole 102. 102a is fitted. Next, the first outside air storage chamber 112a of the blower 112 is sandwiched by fingers, the first outside air storage chamber 112a is elastically deformed, and then the force of the sandwiched fingers is relaxed. The operation of returning 112a to the shape before elastically deforming is repeated.

By operating the blower 112 in this manner, outside air is supplied to the inside 100a of the camera. This outside air is blown from the nozzles 114a, 114b, 114c through the insertion hole 102, the ventilation / non-water-permeable filter 118, the tube 110, and the tubes 110a, 110b, 110c, and corresponds to the nozzles 114a, 114b, 114c, respectively. The air is blown to the side of the optical system that faces the inside 100a of the camera.

The present invention is not limited to the configuration of the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

For example, in the above-described embodiment, the outside air is described as being supplied to the inside 100a of the camera by the blower 112 through the insertion hole 102, but the present invention is not limited to such a configuration. As shown in FIG. 5, an air supply unit that acts as a pump by separating the central portion from the camera body 104 by a predetermined distance and covering the periphery of the insertion hole 102 from the outside of the camera body 104 with an elastic member such as rubber. A second outside air storage chamber 116a is formed, and the second outside air storage chamber 116a is elastically deformed by a photographer or the like to insert the second outside air storage chamber 116a into the camera interior 100a through the insertion hole 102 and the tube 110. The outside air stored in the chamber 116a may be configured to be supplied to the inside 100a of the camera. As shown in FIG. 6, a check valve 116c that regulates the supply direction of the outside air to one direction is provided in the second outside air introducing hole 116b, and the outside air is supplied from the second outside air introducing hole 116b to the first outside air introducing hole 116b. 2 is introduced into the outside air storage chamber 116a.

Further, in the above-described embodiment, the invention of the present application has been described by being applied to the camera 100 (a camera in which the lens barrel does not expand and contract), but the invention is not limited to such a configuration, and It can also be used in a camera 100 'whose lens barrel expands and contracts as shown in FIG. In this case, when the lens barrel 108 'is expanded or contracted, the outside air is introduced into the inside 100a of the camera (due to the change in atmospheric pressure inside the camera 100a due to the expansion or contraction of the lens barrel 108'), so that it is necessary to provide an air supply means. There is no. Since the taking lens group 108 moves as the lens barrel 108 'expands and contracts, it is necessary to move the tube 110 for blowing the outside air inside the taking lens group 108 according to the movement of the lens barrel 108'. However, as shown in FIG. 8, if the tube 110 is formed into a spiral 110 'in the middle to be expandable and contractible, the occurrence of entanglement of the tube 110 due to the movement of the lens barrel 108' can be eliminated, and The space for disposing the tube 110 can be reduced.

Further, in the above-described embodiment, the description has been made by applying the dew condensation removing device in the camera to the finder 106 and the photographing lens group 108 as the optical system, but the present invention is not limited to this configuration. Instead, it may be applied to another optical system, for example, a lens for projecting and receiving infrared rays for measuring the distance to a subject.

Further, in the above-described one embodiment, the blower 112 is used as the air supply means, but the present invention is not limited to such a configuration, and a syringe or a commercially available compressed air is used. It is also possible to use a cylinder or the like having a function of supplying air, such as a cylinder.

[0030]

[Effect of device]

 As described above in detail, by configuring the dew condensation preventing device in the camera according to the present invention, it is generated in the optical system such as the viewfinder, the photographing lens group, and the lens for projecting and receiving infrared rays emitted for distance measurement. It has become possible to provide a dew condensation removal device for cameras that can quickly remove dew condensation.

[Brief description of drawings]

FIG. 1 is a plan view showing a side view of a configuration when a dew condensation removing device in a camera according to the present invention is applied to a camera in which a lens barrel does not expand and contract.

FIG. 2 is a plan view showing the configuration from the top when the dew condensation removing device in the camera according to the present invention is applied to a camera in which the lens barrel does not expand and contract.

FIG. 3 is a diagram illustrating a connection portion between a camera body and a tube shown in FIG.

FIG. 4 is a perspective view showing a shape of a nozzle used in the dew condensation removing device in the camera according to the present invention.

FIG. 5 is a plan view showing a modified example of the dew condensation removing device in the camera of the present invention.

FIG. 6 is a diagram for explaining the check valve shown in FIG.

FIG. 7 is a plan view showing the configuration from the top when the dew condensation removing device in the camera according to the present invention is applied to a camera in which the lens barrel expands and contracts.

8 is a diagram showing a state of a tube in a state where a lens barrel of the camera shown in FIG. 7 is contracted.

[Explanation of symbols]

 100 camera (camera in which the lens barrel does not expand and contract) 100 'camera (camera in which the lens barrel expands and contracts) 100a camera inside 102 insertion hole 102a concave portion 102b convex portion 102c tube mounting portion 104 camera body 106 viewfinder 108 shooting lens group 108' lens Lens barrel 110 tube 110 'tube spiral part 112 blower 112a first outside air storage chamber 112b first outside air introduction hole 112c outside air outlet 114 nozzle 115 blowout port 116a second outside air storage chamber 116b second outside air introduction hole 116c Check valve 117 Clip portion 118 Breathable water-impermeable filter 120 Step 122a Tube inlet inner diameter 122b Tube central inner diameter 124 Back lid 126 Battery storage chamber 128 Capacitor 130 Film winding chamber 132 Patrow Room

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[Procedure amendment]

[Submission date] July 28, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

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Claims (3)

[Scope of utility model registration request] 1. Condensation generated on the inside of the camera of an optical system such as a viewfinder and photographing lens of the camera is removed by blowing outside air to the inside of the camera of the optical system on which condensation has been generated by an air supply means. A dew condensation removing device for a camera. 2. A dew condensation removing device for removing dew condensation generated inside the camera of an optical system such as a viewfinder and a taking lens of the camera, the camera body having an insertion hole for inserting the inside and the outside of the camera, A pipe line connected to the insertion hole from the inside of the camera for guiding the supplied outside air to the inside of the camera of the optical system; and an air supply unit for supplying the outside air to the pipe. A dew condensation removing device for a camera. 3. The dew condensation removing device in a camera according to claim 1, further comprising a water droplet intrusion preventing unit for preventing intrusion of water droplets from the outside into the camera.