JPS60227236A - Lens cap - Google Patents

Abstract

PURPOSE:To permit sure mounting and easy attaching and detaching of a lens cap by providing orthogonally two sliding operating members facing each other and two sliding members facing each other to a cap body and attaching and detaching the projecting parts of the sliding operating members to and from the slopes of the sliding members. CONSTITUTION:The two sliding operating members 2 which face each other and are provided in the direction running the center of the cap body 1 are guided by the sliding groove 1a of the cap body 1 and are held energized outward by springs 3. The two sliding members 5 facing each other are provided orthogonally with the members 2, are guided by the sliding groove 1a' and are held energized outward by springs 3'. The members 2 have projecting parts 2c which attach and detach to and from the slopes 5c of the members 5. The parts 2c press the slopes 5c and the members 5 are also pressed toward the center, by which the cap 1 is removed when the user pushes the members 5 toward the center. The cap is mounted when the user fits the cap to a lens barrel by pushing the members 5 and releases the hand from the cap. The disengagement of the cap during mounting is thus prevented even if casual external force is exerted thereto and the easy attaching and detaching of the cap are made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to the structure of lenses for optical equipment such as cameras and caps for general equipment.

(Conventional example) As shown in FIG. 1, conventionally, a sliding operation member 2 that slides in a straight line passing through the center of a cap body 1 and has an engaging portion 2b that engages with a lens mirror 114, etc., is opposed. In the case where two caps are provided, as shown in FIG. 2, if an unexpected external force is applied to one sliding operation member 2 as shown by the arrow, it will easily engage with the lens barrel 4, etc. There was a drawback that the cap would fall off due to detachment.

(Purpose) The present invention has focused on the above-mentioned drawbacks of the conventional technology, and can be installed with the same simple operation as the conventional method without causing the cap to fall off even when an external force is applied to the rear sliding operation member 2. The purpose of the present invention is to provide a cap capable of holding more reliable delivery.

(Structure) FIG. 3 shows the arrangement of the sliding operation member 2 and the sliding member 5 attached to the lens barrel 4 etc. in an embodiment of the present invention. Two sliding operation members 2 are arranged facing each other in a straight line passing through the center of the cap body 1, and are guided by the sliding groove 1a of the cap body 1. This sliding operation member 2 is biased by a spring 3 so as to protrude outward from the main body, and is locked to the sliding groove end 1b of the cap main body 1 by a locking portion 2a, thereby restricting its protrusion. The sliding member 5 is the sliding operation member 2
The two are arranged opposite each other in a linear direction perpendicular to the sliding direction of the main body, and are similarly guided by the sliding groove 1a' and biased by a spring 3 to protrude outward from the main body. A locking portion 5a is provided and locks onto the end portion 2c of the sliding operation member 2 to limit protrusion. The sliding operation member 2 and the sliding member 5 are respectively provided with engaging portions 2b and 5b on their peripheral edges, which engage with an engaging portion 4a of the lens barrel 4 or the like. The sliding operation member 2 is provided with the end portion 2c, and the sliding member 5 is provided with an inclined surface 5c, and when attached to the lens barrel 4 etc. in FIG. 3, they are always spaced apart by ΔQ. It is configured to be secured.

(Function) Figure 4 is a diagram after the operation when the sliding operation member 2 is pressed toward the center when attaching or detaching the cap, and the sliding operation member 2 is moved from the state shown in Figure 3 to the opposite 2.
When one sliding operation member 2 is pressed, the end portion 2c moves to the sliding member 5.
When the end portion 2c comes into contact with the inclined surface 5c and is further pressed, the end portion 2c relatively slides on the inclined surface 5c and the sliding member 5 also moves toward the center, so that the cap can be attached or removed.

Here, even if the sliding member 5 is moved toward the center, the sliding operation member 2 does not move toward the center, so that an erroneous operation will occur when attaching and detaching the slide member 2. Therefore, the slide member 2 cannot be pushed from the outside.

FIG. 5 shows a state in which an inadvertent external force is applied to one of the sliding operation members 2 after the cap of the present invention is attached to the lens barrel 4, etc., as in the conventional example, which can also be seen from FIG. This shows that even when pressed by a predetermined amount ΔQ, one sliding operation member 2 and the two opposing sliding members 5 do not move toward the center, making it possible to reliably hold the cap attached. ing.

Furthermore, even if one sliding operating member 2 is pressed by an actuation amount of 60 or more due to an unexpected external force and the end portion 2C and the inclined surface 5c come into contact, the two opposing sliding members 5 will be affected by the dashed arrows. Since the force is applied in the direction, a frictional force that hinders the sliding movement of the sliding member 5 acts between the sliding member 5 and the sliding groove 1a, so it is difficult for the sliding member 5 to slide toward the center. Therefore, the installation status is maintained.

In addition, since the amount of engagement between the engaging portions 2b and 5b of the sliding operation member 2 and the sliding member 5 and the engaging portion 4a of the lens mirror Wi44 etc. is determined by the shape of the screw thread in a camera lens, etc., the inclined surface 5C By making the angle O formed by the sliding direction of the sliding operating member 5 into an acute angle, it is possible to increase the amount of operation of the sliding operating member 2 relative to the sliding member 5. Therefore, the amount of operation of the sliding operating member 2 can be increased. The engagement between the sliding member 5 and the lens barrel 4 becomes difficult to disengage due to unexpected external force.

(Effects) According to the present invention, two opposing sliding operation members 2,
Similarly, by arranging the two opposing sliding operating members 5 orthogonally on the cap body 1, and by providing the end portion 2c and the inclined surface 5c, it is possible to prevent damage to the sliding operating member 5 with the same simple operation as before. The cap is able to maintain its attached state without falling off even when subjected to severe external forces, which has the effect of further improving the functionality of the cap.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional example, Fig. 2 is a sectional view of the conventional example showing the relationship between attachment and detachment of a lens, etc., and Fig. 3 is an embodiment of the present invention, showing a state in which it is attached to a lens barrel, etc. FIG. 4 is a plan view showing a state in which the operating member 2 is pressed;
FIG. 5 is a diagram showing a state in which an external force is applied after the cap is attached to the lens barrel, etc., and FIG. 6 is a sectional view of FIG. 5. (Explanation of symbols) 1... Cap body 1a, la'... Sliding groove 1b
...Sliding groove end IC...Spring hook part 2...Sliding operation member 2a...Locking part 2b...Engaging part 2C...
・End part 3...Spring 4...Lens barrel, etc. 4a...
・Engagement part 5...Sliding member 5a...Locking part 5b...Engagement part 5C...° Inclined surface Patent applicant Asahi Optical Industries Co., Ltd. 1932 Figure 2

Claims (1)

[Scope of Claims] 1. Two operating members that slide while being guided by a linear sliding groove passing through the center of the cap main body are arranged facing each other and are urged outward from the main body by a spring, and a locking portion of the operating members is provided. The protrusion is restricted by the sliding groove end of the cap body, and the two sliding members, which similarly slide guided by the sliding groove in a linear direction perpendicular to the sliding direction of the operating member, are arranged facing each other and facing the outside of the main body. The sliding member is biased by a spring, and the sliding member is provided with an inclined surface.The operating member is provided with an end that comes into contact with the inclined surface, so that the operating member slides in conjunction with the sliding toward the center of the operating member due to pressure. 1. A lens cap characterized in that a member slides toward the center, and the outward protrusion of the sliding member is limited by a locking portion attached to an inclined surface and an end portion of an operating member. 2. In the cap according to claim 1,
When attached to a lens barrel, etc., the inclined surface and the end do not come into contact with each other.