JPS6124982Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses the elasticity of the mount spring interposed between the camera side mount and the lens side mount to press and hold the lens to be attached to the reference surface on the front surface of the camera side mount. The purpose of this product is to provide a camera side mount and mount spring that are easy to assemble and do not require drilling screw holes to attach the mount spring to the camera side mount. There is.

The details of the present invention will be explained below based on the drawings.

FIG. 1 shows a sectional view of the main parts of an embodiment of the present invention, and FIG. 2 shows a partial sectional perspective view of the same embodiment.

Mount spring 3 formed into an integral hollow disk shape
has three elastic bending protrusions 3a on its outer periphery, and one of the bending protrusions 3a is provided with a slot 3b. The camera side mount 2 is fixed to the main body 1, and the back surface of the mount 2 including the bayonet claw 2a has a contact holding surface 2b of the circular mount spring 3 and a corresponding contact holding surface 2.
A cylindrical locking groove 2c for locking the bent protrusion 3a is provided on the outer periphery of b, and the locking groove 2c
A fitting hole 2e passing through is provided. A fitting and locking shaft 5 is fitted into the fitting hole 2e. Insert the mount spring 3 from the back side of the mount 2, and bend the bent protrusion 3a so that the slot 3b of the bent protrusion 3a engages with the fitting and locking shaft 5.
is inserted into the locking groove 2c of the mount and abuts and locks, the mount spring 3 engages with the abutment holding surface 2c.
b and is held in the optical axis direction, and the elasticity of the mount spring 3 pushes the lens side bayonet pawl 4a to press and hold the lens side reference surface 4b to the camera side mount reference surface 2d, and the slot 3b is pressed against the camera side mount reference surface 2d. By engaging with the fitting and locking shaft 5, the mount spring 3 is prevented from rotating when the lens is attached or detached. In addition to the above, to prevent rotation when attaching and detaching the lens, a locking hole that reaches the locking groove from the outer peripheral side of the mount 2 is provided, and the length of one of the bent protrusions 3a is extended. A conceivable option is one that engages with a locking hole.

The camera side mount and mount spring according to the present invention configured as described above does not require the use of screws, etc., which are conventionally used for attaching the mount spring, and has the advantage that assembly is facilitated.

[Brief explanation of the drawing]

FIG. 1 shows a main sectional view of an embodiment of the present invention, and FIG. 2 shows a partially sectional perspective view of the same embodiment. 1: Camera body, 2: Camera side mount, 2
a: Camera side mount bayonet claw, 2b: Contact holding surface, 2c: Locking groove, 2d: Camera side mount reference surface, 2e: Fitting hole, 3: Mount spring, 3
a: Bending protrusion, 3b: Slot, 4: Lens, 4a: Lens side bayonet claw, 4b: Lens side reference surface, 5: Fitting and locking shaft.

Claims (1)

[Scope of utility model registration request] Bayonet mount for interchangeable lens cameras.
Due to the elasticity of the mount spring interposed between the camera-side mount and the lens-side mount, the lens to be mounted is pressed against the reference surface on the front surface of the camera-side mount and positioned in the optical axis direction. A hollow disk-shaped mount spring having at least three elastic bending protrusions, a circular abutting and holding surface on the back surface of the bayonet pawl, and a cylindrical locking groove provided on the outer periphery of the corresponding abutting and holding surface. A camera side mount comprising a camera side mount, wherein the mount spring is inserted into the camera side mount from the back side of the camera side mount, and the bent protrusion is locked in the locking groove. Spring combination.