JPH0342424Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved plug-in filter holder.

The object of the present invention is that when the filter holder is inserted through the insertion port provided in the intermediate barrel of the lens barrel, and the locking button provided on the filter holder is rotated and set to the lock position, the locking button is locked. The filter holder cannot be rotated, thereby preventing the filter holder from inadvertently detaching from the lens barrel during shooting or carrying.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a filter holder to which a filter 7 is attached, and the filter holder 1
are the mounting frame portion 1a and the flange portion 1b of the filter 7.
The filter holder 1 is constructed by inserting the mounting frame 1a of the filter 7 into the intermediate barrel 8 through an insertion port 8a formed on the outer peripheral surface of the intermediate barrel 8 of the lens barrel, and inserting the mounting frame 1a of the filter 7 into the intermediate barrel 8. As shown in FIGS. 1 and 2, it is fixed to the intermediate barrel 8 by externally operating a provided lock button 3 as described below.

Further, a bearing member 2 that rotatably supports a lock shaft 4 of the lock 3 is fixed to the center of the flange 1b of the filter holder 1 with a screw 6, and the upper end of the lock shaft 4 is It is fixed to the inner top wall of the lock button 3 with a screw 3a, and the lock shaft 4
The shaft portion is the flange portion 1b of the filter holder 1.
The lower end of the lock shaft 4 has a lock pawl 4a that engages with the inner circumferential surface of the intermediate barrel 8.
is provided.

Furthermore, the inner top wall of the lock button 3 and the bearing member 2
A spring 5 is loaded between the lock button 3 and the bottom surface of the lock button 3, and the lock button 3 and lock shaft 4 are normally urged outward by the elasticity of the spring 5.

Next, opposing locking protrusions 2a and 2b are vertically provided at the lower end of the bearing member 2, passing through the through hole of the flange 1b, and one of the locking protrusions 2b is as shown in FIG. When the lock button 3 is pressed and rotated, the top surface of the lock pawl 4a and its tip surface are long enough to engage with each other. The upper surface of the locking claw 4a cannot be engaged with the tip thereof, but has a length that contacts and guides the side surface of the locking claw 4a.

Further, the groove formed between the locking protrusions 2a and 2b can be formed by rotating the lock button from the state shown in FIGS.
The lock pawl 4a itself falls into the groove when it engages with the inner circumferential surface of the lock button 3, and the lock button 3 is formed in such a width that the lock button 3 cannot be rotated.

Next, to explain the function of the present invention, the first
When fixing the filter holder 1 to the intermediate barrel 8, first, as shown in FIGS. Leave it in contact with the side wall of filter holder 1a, and in this state, remove filter holder 1.
Completely insert the mounting frame 1a into the intermediate barrel 8 through the insertion port 8a formed in the intermediate barrel 8 of the lens barrel, and further press the lock button 3 against the force of the spring 5 to rotate it. When the lock pawl 4a is rotated from the state shown in FIG. 8 to the state shown in FIG. At the same time, when the tip of the lock claw 4a engages with the inner circumferential surface of the intermediate barrel 8, the rotation of the lock button 3 is blocked, and the filter holder 1 is fixed to the lens barrel as shown in FIGS. It is fixed to the intermediate body 8.

Second, when removing the filter holder 1 from the intermediate barrel 8, the operation is the reverse of the above-mentioned case. First, as shown in FIG. When the lock pawl 4a is taken out from the groove between the two and the lock button 3 is rotated to rotate the lock pawl 4a from the state shown in FIG. When the engagement with the inner peripheral surface of the intermediate barrel 8 is released, the upper surface of the lock claw 4a engages with the upper end surface of the locking protrusion 2b, and the filter holder 1 can be pulled out from the insertion port 8a of the intermediate barrel 8. .

The present invention is constructed as described above, so that when the fixing lock claw falls into the locking groove by the force of a spring, the rotation of the lock button is prevented, and the lock button is locked by an external force. The button does not rotate, so
This prevents the filter holder from accidentally detaching from the lens barrel while shooting or carrying it around, and it is easy to remove the filter holder from the lens barrel. Since the rotation is restricted to a certain direction, the user can
For example, it is always known that turning the lock button to the left indicates the disengaged state and turning the lock button to the right indicates the engaged state, making it possible to operate the lock button without looking at any special landmarks, so its practicality is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a filter holder attached to the intermediate barrel of a lens barrel. FIG. 2 is a front sectional view of FIG. 1. FIG. 3 is an enlarged side view of FIG. 1.
FIG. 4 is an enlarged front view of FIG. 2. Figure 5 shows the fourth
A view of the figure from the bottom of the page. Figure 6 shows lock button 3.
This is a diagram of pushing down downwards. FIG. 7 is a front view of the filter holder removed from the lens barrel by rotating the lock button 3. Figure 8 shows the 7th
A view of the figure from below. 1: Filter holder, 2: Bearing, 2a, 2
b: Locking protrusion, 3: Lock button, 4: Lock shaft, 4
a: Lock claw, 5: Spring, 7: Filter, 8:
Intermediate body, 8a: Inlet.

Claims (1)

[Scope of utility model registration request] In the filter holder that is inserted into the lens barrel from the insertion port provided on the lens barrel,
a bearing provided on the filter holder; a lock shaft that is spring-biased in the axial direction of the bearing and rotatably supported; and a lock claw provided on the lock shaft that is engageable with the lens barrel. and a knob provided at the outer end of the locking claw;
It consists of a pair of lock pawl retaining protrusions vertically installed on the inner end of the bearing, and the pair of lock pawl retaining protrusions are
The lock pawl that is engaged with the lens barrel is positioned between the pair of lock pawl engaging protrusions to a height that prevents rotation, and either of the lock pawl engaging protrusions is not engaged with the lens barrel. A filter holder characterized by having a height that holds a locking claw in a locked state.