Blade opening and closing device and imaging apparatus

Patent metadata

Field	Value
Publication number	US-11131900-B2
Application number	US-201816619527-A
Country	US
Kind code	B2
Filing date	Apr 25, 2018
Priority date	Jun 14, 2017
Publication date	Sep 28, 2021
Grant date	Sep 28, 2021

Abstract

Provided are a first magnetic drive unit including a first coil and a first magnet, and a second magnetic drive unit including a second coil and a second magnet. Also provided are a first drive lever and a second drive lever operated by the first magnetic drive unit and the second magnetic drive unit, respectively, a first opening and closing blade and a second opening and closing blade that open and close an opening by an operation of the first drive lever and the second drive lever, respectively. A first lock mechanism locks the first drive lever at a predetermined position, and a second lock mechanism that locks the second drive lever at a predetermined position, and a part of the first lock mechanism and a part of the second lock mechanism are located between the first magnetic drive unit and the second magnetic drive unit.

First claim

The invention claimed is:

1. A blade opening and closing device, comprising:
a first magnetic drive unit including:
a first coil, wherein a first drive current is supplied to the first coil; and
a first magnet configured to rotate with electric conduction to the first coil;

a second magnetic drive unit including:
a second coil, wherein a second drive current is supplied to the second coil; and
a second magnet configured to rotate with electric conduction to the second coil;

a first drive lever, wherein the first magnetic drive unit is configured to operate the first drive lever;
a second drive lever, wherein the second magnetic drive unit is configured to operate the second drive lever;
a first opening and closing blade configured to open and close an opening by an operation of the first drive lever;
a second opening and closing blade configured to open and close the opening by an operation of the second drive lever;
a first lock mechanism configured to lock the first drive lever at a first position; and
a second lock mechanism configured to lock the second drive lever at a second position, wherein
the first lock mechanism and the second lock mechanism are located in a point-symmetric arrangement state, and
a part of the first lock mechanism and a part of the second lock mechanism are located between the first magnetic drive unit and the second magnetic drive unit.

2. The blade opening and closing device according to claim 1 , wherein
the part of the second lock mechanism is located between the first magnetic drive unit and the part of the first lock mechanism, and
the part of the first lock mechanism is located between the second magnetic drive unit and the part of the second lock mechanism.

3. The blade opening and closing device according to claim 2 , wherein
the part of the first lock mechanism and the part of the second lock mechanism are in an intersecting state in a direction orthogonal to a direction of arrangement of each of the first magnetic drive unit and the second magnetic drive unit.

4. The blade opening and closing device according to claim 2 , wherein
the first lock mechanism includes:
a first lock lever configured to restrict that restricts the operation of the first drive lever based on a turning position of the first lock lever;
a first action lever configured to restrict turn of the first lock lever based on a turning position of the first action lever; and
a first attracting body configured to hold the first action lever by attraction,

the second lock mechanism includes:
a second lock lever configured to restrict the operation of the second drive lever based on a turning position of the second lock lever;
a second action lever configured to restrict turn of the second lock lever based on a turning position of the second action lever; and
a second attracting body configured to hold the second action lever by attraction,

the second attracting body is located between the first magnetic drive unit and the first attracting body,
the first attracting body is located between the second magnetic drive unit and the second attracting body,
a turning shaft of the first action lever is located between the first magnetic drive unit and the first attracting body, and
a turning shaft of the second action lever is located between the second magnetic drive unit and the second attracting body.

5. The blade opening and closing device according to claim 4 , wherein
the first drive lever includes a first portion to be locked,
the second drive lever includes a second portion to be locked,
a locked state of the first opening and closing blade is set by an engagement of the first lock lever with the first portion to be locked,
a locked state of the second opening and closing blade is set by an engagement of the second lock lever with the second portion to be locked,
the locked state of the first opening and closing blade is set and released based on a rotation position of the first magnet,
the locked state of the second opening and closing blade is set and released based on a rotation position of the second magnet,
the first lock lever is moved between a locked position where the locked state is set and an unlocked position where the locked state is released based on a change in a first magnetic force with rotation of the first magnet, and
the second lock lever is moved between the locked position and the unlocked position based on a change in a second magnetic force with rotation of the second magnet.

6. The blade opening and closing device according to claim 5 , wherein
the first portion to be locked includes a first engagement portion configured to engage one of the first lock lever or the second lock lever in an open state of the opening, and
the second portion to be locked includes a second engagement portion configured to engage other of the first lock lever or the second lock lever in a closed state of the opening.

7. The blade opening and closing device according to claim 6 , wherein
the first drive lever includes a first engagement piece as the first portion to be locked,
the second drive lever includes a second engagement piece as the second portion to be locked, and
both edges of the first engagement piece and the second engagement piece are formed as the first engagement portion and the second engagement portion, respectively.

8. The blade opening and closing device according to claim 1 , wherein
the first lock mechanism includes:
a first lock lever configured to restrict the operation of the first drive lever based on a turning position of the first lock lever; and
a first action lever configured to restrict turn of the first lock lever based on a turning position of the first action lever,

the second lock mechanism includes:
a second lock lever configured to restrict the operation of the second drive lever based on a turning position of the second lock lever; and
a second action lever configured to restrict turn of the second lock lever based on a turning position of the second action lever,

the first action lever and the first lock lever share a first turning shaft, and
the second action lever and the second lock lever share a second turning shaft.

9. The blade opening and closing device according to claim 1 , wherein
the first magnetic drive unit and the second magnetic drive unit are located in a line-symmetric arrangement state.

10. The blade opening and closing device according to claim 1 , wherein
a part constituting the first lock mechanism and a part constituting the second lock mechanism is common.

11. The blade opening and closing device according to claim 1 , wherein
a direction of arrangement of each of the first magnetic drive unit and the second magnetic drive unit coincides with a direction of arrangement of each of the first opening and closing blade and the second opening and closing blade.

12. The blade opening and closing device according to claim 1 , wherein
a direction of arrangement of each of the first lock mechanism and the second lock mechanism coincides with a direction of arrangement of each of the first opening and closing blade and the second opening and closing blade.

13. The blade opening and closing device according to claim 1 , wherein
the first magnetic drive unit, the second magnetic drive unit, the first lock mechanism, and the second lock mechanism are arranged in a housing case.

14. The blade opening and closing device according to claim 13 , wherein
the housing case includes a partition between one of:
the first magnetic drive unit and at least one of the first lock mechanism or the seco

Assignees

• Sony Corp

Inventors

• Yoneda Masafumi
• Hayashi Toshiro

Classifications

• G02B26/023

  comprising movable attenuating elements, e.g. neutral density filters · CPC title

• G03B9/58

  Means for varying duration of "open" period of shutter · CPC title

• G03B9/40 Primary

  Double plate · CPC title

• G03B9/42 Primary

  with adjustable slot; with mechanism controlling relative movement of plates to form slot · CPC title