Optical element unit and optical apparatus

  • US 10,901,306 B2
  • Filed: 08/23/2019
  • Issued: 01/26/2021
  • Est. Priority Date: 09/04/2018
  • Status: Active Grant
First Claim
Patent Images

1. A filter unit configured to be insertable into and removable from an opening portion provided in an adaptor, wherein the adaptor is detachable with a lens apparatus and an image pickup apparatus, the filter unit comprising:

  • a first filter;

    a holding member configured to hold the first filter; and

    a lock piece having a lock piece claw;

    wherein the opening portion has a first portion with a first inner diameter and a second portion with a second inner diameter smaller than the first inner diameter,wherein the holding member includes a third portion with a first outer diameter and a fourth portion with a second outer diameter smaller than the first outer diameter,wherein a fourth portion includes a tapered surface inclined to a normal line direction of a first surface of the first filter,wherein, in a case where the filter unit is inserted into the opening portion with the first surface facing toward a first side in an optical axis direction, the third portion faces the first portion, the fourth portion faces the second portion, and the lock piece claw engages with a lock piece end formed on a part of the opening portion facing the first portion in the optical axis direction, so that the filter unit is attached to the adaptor, andwherein, in a case where the filter unit is inserted into the opening portion with the first surface facing toward a second side opposite to the first side, the third portion contacts the second portion, so that the filter unit is not attached to the adaptor.

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