JPH06294994A - Interchangeable lens for waterproof camera - Google Patents

Abstract

PURPOSE:To surely prevent flood or the like from occurring without deviating an outer cylinder part by providing an O-ring arranged one round near an outer cylinder mount part and outside along an outer cylinder. CONSTITUTION:An inner mount part 5 for mounting a photographing lens is fixed to the front surface of a main body component part 1. An outer mount part 2a for mounting a waterproof lens is provided on the front surface of an outer case part. Besides, a waterproof sheet part 2b by the O-ring and plural outer bayonet pawl parts 2c are provided. A waterproof glass 8 is disposed at the aperture of the front surface of the lens outer cylinder part 7 and a gap between the cylinder part 7 and the glass 8 is water-proofed and sealed. At the back part of the outer cylinder part 7, a curcumferential groove part 7a where the O-ring part 10 is loaded and an outer cylinder mount part having plural outercylinder bayonet pawl parts 7b engaged with outer bayonet pawl parts 2c are provided. A photographing lens 12, a diaphragm control mechanism, a distance control mechanism or the like are disposed at an inner cylinder part 11 and the cylinder part 11 is supported by an inner cylinder mount part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interchangeable lens which is replaceably attached to a waterproof camera.

[0002]

2. Description of the Related Art Conventionally, as a lens mount mechanism for this type of waterproof camera and interchangeable lens, Japanese Patent Publication No. 39-551.
No. 9 publication is known and has a structure as shown in FIG. In FIG. 7, the main body mechanism part (71) is an outer box (72).
The outer box (72) is housed and supported so that it will not be affected even if it is deformed by pressure. The O-ring is provided between the outer box (72) and the back cover (73) pivotally supported by the outer box (72). (74) provides a waterproof seal. A mount section (75) is fixed to the main body mechanism section (71). Further, an opening (72a) is provided on the front surface of the outer box (72).

On the other hand, the lens mechanism section is composed of an outer cylinder section (76) and an inner cylinder section (77), and the inner cylinder section (77) includes a taking lens (78), a distance adjusting mechanism (not shown), an aperture adjusting mechanism and the like. It is composed by. The outer cylinder part (76) is composed of a pressure-resistant waterproof mechanism, and a waterproof glass (79) is attached to the front opening via an O-ring (710) and is waterproof-sealed.
Further, an O-ring (711) is fitted in the circumferential groove (76a) provided around the rear opening. As a result, when the lens is mounted on the camera, a waterproof seal is provided between the lens outer cylinder part (76) and the outer box (72). Inner tube part (77)
A lens mount portion (712) is fixed to the. The lens mount portion (712) pivotally supports the outer cylinder portion (76) through a plurality of shafts (713) so as to be movable in the optical axis direction. A spring (713) fitted around each shaft (713)
The a) functions to attract the outer cylinder part (76) toward the mount part (712).

When the lens is attached, the body mount (75)
The bayonet part (712a) of the lens mount part (712) meshes with the plurality of bayonet claw parts (75a) of the lens inner tube part (77) by the urging force of the spring (713a).
Is fastened to the main body mechanical part. With the above configuration, the main body mechanism section (71) and the lens inner cylinder section (77) are connected to the outer box section (7
2) Even if the lens outer cylinder portion (76) is deformed by water pressure, it is not affected by it and the function can be maintained.

[0005]

However, the above-mentioned configuration has the following problems. Lens outer cylinder (7
6) and the outer box opening (72a) are fitted with a waterproof seal structure simply by an O-ring (711), so that a force in the direction perpendicular to the optical axis is applied to the lens outer cylinder (76). If the force is equal to or greater than the force of the spring (714), the outer cylinder part (76) is inclined with respect to the outer box (72). Further, when the pressure inside the camera is higher than the external pressure and the magnitude thereof exceeds the force of the spring (714), the lens outer cylinder part (76) floats from the outer box part (72). In either case, the waterproof sealing effect of the O-ring (711) becomes incomplete, and water may leak.

[0006]

A waterproof camera having an inner cylinder portion including an optical system and an outer cylinder portion having a waterproof structure for holding the inner cylinder portion therein is provided with a structure of the present invention for solving the above problems. In the interchangeable lens for use, an outer cylinder mount portion provided at an end portion of the outer cylinder portion, an inner cylinder mount portion provided at an end portion of the inner cylinder portion, and the outer cylinder mount portion near and outside the outer cylinder mount portion. And an O-ring arranged around the outer cylinder once.

[0007]

With this structure, it is possible to prevent water from entering the outer cylinder without being displaced, and to drain water or the like accumulated on the outside of the O-ring when the outer cylinder is removed.

[0008]

FIG. 1 is an embodiment of the present invention, which is a sectional view in a plane including a lens optical axis, showing a state in which a waterproof lens unit is waterproofly attached to a waterproof camera unit by a bayonet. 2 is an enlarged sectional view thereof. In FIG. 1, the main body mechanism part (1) of the waterproof camera is a waterproof structure including an outer box part (2), a back cover part (3), and an O-ring (4) that waterproofly seals between them. It is accommodated and supported inside the pressure resistant structure, and is supported so as not to be affected even if the outer box (2) and the back cover (3) are deformed by external pressure. The main body mechanism section (1) includes a holding mechanism that holds the film at a predetermined position behind the lens, a film winding mechanism, a shutter mechanism, and the like.

An inner mount portion (5) for mounting a taking lens is fixed to the front surface of the main body mechanism portion (1). In FIG. 2, a plurality of inner bayonet claws (5
a) and (5b) are provided, and a plurality of bayonet springs (6) for crimping and engaging an inner cylinder mount on the lens side described later with the main body mount (5) are provided.

An outer mount portion (2a) for mounting a waterproof lens is provided on the front surface of the outer box portion, and a waterproof seal portion (2b) by an O ring and a plurality of outer bayonet claw portions (2c), (2).
d) and are provided. Next, the structure of the waterproof lens unit will be described. In FIG. 1, a waterproof glass (8) is provided in the front opening of the lens outer cylinder part (7), and an O-ring (9) is used for waterproofing between the outer cylinder part (7) and the waterproof glass (8). Seal it. At the rear part of the outer cylinder part (7), a peripheral groove part (7a) for mounting the O-ring (10) and a plurality of outer cylinder bayonet claw parts (7b) fitted to the outer bayonet claw parts (2c), (2d). ), (7c) and the outer cylinder mount (7
0) and are provided.

A photographing lens (12) is attached to the inner cylinder portion (11).
A diaphragm control mechanism, a distance control mechanism and the like are provided and supported by the inner cylinder mount portion (13). Inner cylinder mount (1
3) a plurality of inner cylinder bayonet claws (13a), (13)
b) is provided. The outer cylinder end face (7
f) and the mount end face (13) of the inner cylinder mount (13)
A spring (14) is held between the outer cylinder part (7) and c).
And the inner cylinder mount portion (13) are urged in a direction in which they are separated from each other in the optical axis direction.

The outer cylinder mount (70) has a recess (7a).
However, the inner cylinder mount portion (13) is provided with a convex portion (13d) and is fitted to each other to restrict relative rotation between the inner mount (13) and the outer cylinder portion (7). The inner cylinder part (11) is supported so as to be movable with respect to the part (7) by a slight amount in the optical axis direction. This movable amount is set to an amount required for engaging the bayonet claw portion.

FIG. 3 is a plan view of the interrelated positions of the respective bayonet claws before engagement. In this embodiment, the number of bayonet claws is two. As shown in FIGS. 5 and 6, the lock pin (15) is provided on the inner cylinder mount portion (5),
The recess (13f) is movable in the optical axis direction, and the recess (13f) is provided on the end surface (13e) of the inner cylinder mount portion (13) corresponding to the lock pin (15). One end (15a) of the lock pin (15) when the waterproof lens is completely attached as shown in FIG.
Falls into the recess (12f) to lock the rotation of the waterproof lens.

5 and 6, the lock pin (15)
Is a direction in which one end (15a) is projected from the inner mount (5) by the spring (16) by penetrating the inner cylinder mount (5) and the hole formed in the support member (18) in the optical axis direction (in the figure). It is urged to the left). The support member (18) is fixed to the lock pin (15) and abuts on a cam surface (20a) fixed to one end of the shaft (20). Axis (20)
Is axially supported by the outer box part (2), and an O-ring (21) is attached to a circumferential groove in the middle part of the shaft (20) to provide the shaft (20).
A waterproof seal is provided between the outer case and the outer case (2). Axis (2
A lens attaching / detaching lever (22) disposed outside the vicinity of the outer cylinder mount portion (70) is fixed to the other end of (0). A switch member (19) is arranged on the support member (17) on the other end (15b) side of the lock pin (15) and is connected to the control circuit of the main body (1).

The mounting operation of the waterproof lens having the above-described configuration in the waterproof camera will be described. FIG. 5 shows a state immediately after inserting the waterproof lens mount portion into the waterproof camera mount portion. At this time, the relative relationship of each bayonet claw portion is at the position as shown in FIG. 3, and the lock pin (15) and the recess (13f) are provided.
Is in the disengaged position. In this state, in FIG.
By pressing the outer cylinder part (7) in the right direction in the figure against the pressing force of the spring (14), the outer cylinder mount part (70) of the outer cylinder part (7) moves outside the outer box (2). The O-ring (10) is inserted into the mount portion (2a) and elastically deforms between them.

The end surface (13e) of the inner cylinder mount portion is pressed against the main body mount surface (5c) by the urging force of the spring (14), and the lock pin (15) is pushed rightward in the figure, so that the switch (19) operates. Turns on. In the state of FIG. 5,
Since the outer bayonet claws (2c) and (2d) and the outer cylinder bayonet claws (7b) and (7c) interfere with each other in the rotation direction, the waterproof lens cannot be rotated to the position shown in FIG.
When the outer cylinder (7) is pushed further in the right direction in the figure against the spring (14), the interference is completely eliminated at the position where the end faces (7e) and (2e) come into contact, and the waterproof lens rotates. It will be possible.

In this embodiment, the rotation angle required for mounting the waterproof lens is 90 °, and when the waterproof lens is rotated 90 ° from the state shown in FIG. 3, the mounting state shown in FIG. 4 is completed. Each of the bayonet claws is (13a), (5a), (13
b) and (5b), (7b) and (2c), (7c) and (2
d) engages with each other, and as shown in FIG. 6, one end of the lock pin (15) provided in the inner mount (5) in the recess (13f) of the end surface (13e) of the inner cylinder mount (13). (15a) drops due to the urging force of the spring (16) and locks the rotation of the lens. At the same time bayonet spring (6)
As shown in FIG. 2, the inner bayonet claws (13a), (13
b) is pushed to the right in the drawing, and the end surface (13) of the inner cylinder mount portion (13) is attached to the mounting surface (5c) of the inner mount (5).
Since e) is brought into close contact, the inner cylinder portion (11) and the main body mechanism portion (1) are integrated in both directions of rotation and the optical axis. Also, the outer tube part bayonet (7b), (7c) and the outer bayonet (2
c) and (2d) are also engaged with each other, and the outer tube portion (7) is engaged and held by the outer box (2).

Since the lock pin (15) is projected by the urging force of the spring (16) to the position indicated by the broken line in FIG. 6 when the lens is not mounted on the camera, the switch member (1
9) is in the OFF state, but when the lens is inserted into the outer mount portion (2a) as shown in FIG. 5, the switch member (19) is in the first ON state, and as shown in FIG. When it is put in the mounted state, the second ON state is set, and a separate signal is transmitted to the main body camera mechanism section (1).

A detachable lever (22) for removing the lens
Is rotated, and the lever (18) is pushed rightward in FIG. 5 by the cam surface (20b) of the shaft (20) to cause the lock pin (15) and the recess (13f) of the inner cylinder mount (13).
The lens may be unlocked and the lens may be rotated in the direction opposite to the mounting direction. As described above, according to the embodiment of the present invention, (1) since the inner cylinder mount (13) is pressed against the inner mount (5) by the spring (6), the inner cylinder part (11) is held. A sufficient spring force for the spring (6) can be added to the spring (6), and the spring force of the spring (6) becomes the internal force of the inner mount (5) and the inner cylinder mount (13), which increases the spring force as in the known art. Without being affected by focus accuracy,
The inner cylinder portion (11) can be securely fastened to the camera side mount.

(2) Outer cylinder mount (70) on the outer cylinder part (7)
And by engaging the outer cylinder mount (70) with the outer mount portion (2a) of the outer box (2) when the lens is completely attached, the outer cylinder section (7) and the outer box (2) are connected. Since the external cylinder part (7) is integrated, the external cylinder part (7) does not tilt or float even if an external force is applied to the external cylinder part (7) or the internal pressure rises, and the waterproof property is ensured. The seal can be surely done.

(3) Moreover, the outer cylinder mount (70) and the outer mount portion (2a) and the inner cylinder mount (13) and the inner mount (5) are simultaneously engaged by the same operation. Therefore, the operation for attaching and detaching the lens is simple. (4) Since the spring member (14) elastically supports the inner cylinder part (11) and the outer cylinder part (7) in the optical axis direction, the inner cylinder part mount surface (13e) is internally supported when the lens mounting is completed. Mount (5)
Is pressed against the surface (5c). Therefore, the lens can be accurately attached to the camera without being affected by the dimensional variation of each part due to processing and assembly.

(5) Attach the outer cylinder mount (70) to the O-ring (1
By arranging the inside of (0), dust and sand will not adhere to the mount surface during use, and there will be no situation such as graininess when sanding the lens or biting of sand. (6) Between the inner cylinder mount (13) of the inner cylinder part (11) including the lens mechanism part and the inner mount (5), a lock pin mechanism for position regulation in the rotation direction when the lens is mounted on the camera. Since (13f, 15) is provided, the transmission of signals from the lens and the camera is ensured, and the outer cylinder portion (7) and the inner cylinder portion (1
The relative mounting position relationship with 1) does not need to be so strict, and processing and assembly are easy.

[0023]

As described above, according to the present invention, it is possible to reliably prevent water from entering the outer cylinder without shifting the outer cylinder, and to scoop out water accumulated on the outside of the O-ring when the outer cylinder is removed. You can

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a plan view showing a mount portion of the same embodiment.

FIG. 4 is a plan view showing a mount portion of the embodiment.

FIG. 5 is a partially enlarged cross-sectional view of a cross section different from that of FIG.

FIG. 6 is a partially enlarged sectional view of a section different from that in FIG.

FIG. 7 is a cross-sectional view of the prior art.

[Explanation of symbols]

 13: Inner cylinder mount 70: Outer cylinder mount 5: Inner mount 2a: Outer mount

Claims (1)

[Claims] 1. An interchangeable lens for a waterproof camera, comprising: an inner cylinder part including an optical system; and an outer cylinder part having a waterproof structure for internally holding the inner cylinder part, wherein the interchangeable lens is provided at an end of the outer cylinder part. An outer cylinder mount portion; an inner cylinder mount portion provided at an end of the inner cylinder portion; and an O-ring arranged around the outer cylinder mount portion and outside along the outer cylinder. A featured interchangeable lens for waterproof cameras.