Virtual image display device
First Claim
1. A virtual image display device comprising:
- an image element;
an optical member that directs a light from the image element toward an eye of an observer for visual recognition of an image,the optical member having a light guide part that guides an image light from an image display element as the image element to the eye of the observer while reflecting the light inside; and
a frame unit that supports the image element and the optical member so that the optical member may be placed in front of the eye of the observer, whereinthe frame unit has a limiting part that mechanically limits displacement of the optical member partially fixed to the frame unit,the frame unit has a fixing part that is connected to the light guide part to directly fix the light guide part to the frame unit, the light guide part being fixed to the fixing part using an attachment part of the light guide part,all other parts of the light guide part, except the attachment part, are not fixed to the frame unit,the optical member has a lock part locked by the limiting part,the lock part is locked by the limiting part using engagement of a concave portion and a convex portion, andthe lock part has a rib linearly extending along a peripheral part of the optical member, and the limiting part has a groove that is provided to be sandwiched by a pair of the protrusion parts and receives the rib.
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Accused Products
Abstract
A limiting part limits displacement of an optical member partially fixed to a frame unit, and excessive stress applied on the optical member and deformation of the optical member may be prevented. That is, support strength of the optical member may be improved by supplementarily using the limiting part. Note that the optical member is partially fixed to the frame unit, and fastening parts and the number of parts are reduced and downsizing becomes easier and reduction in weight of the virtual image display device is easier. Further, the optical member is partially fixed to the frame unit, and thus, even when there is a difference in coefficient of thermal expansion between the optical member and the frame unit, the expansion or the like of the optical member with respect to the frame unit is allowed and distortion, deformation, breakage of the optical member may be prevented more reliably.
8 Citations
12 Claims
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1. A virtual image display device comprising:
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an image element; an optical member that directs a light from the image element toward an eye of an observer for visual recognition of an image, the optical member having a light guide part that guides an image light from an image display element as the image element to the eye of the observer while reflecting the light inside; and a frame unit that supports the image element and the optical member so that the optical member may be placed in front of the eye of the observer, wherein the frame unit has a limiting part that mechanically limits displacement of the optical member partially fixed to the frame unit, the frame unit has a fixing part that is connected to the light guide part to directly fix the light guide part to the frame unit, the light guide part being fixed to the fixing part using an attachment part of the light guide part, all other parts of the light guide part, except the attachment part, are not fixed to the frame unit, the optical member has a lock part locked by the limiting part, the lock part is locked by the limiting part using engagement of a concave portion and a convex portion, and the lock part has a rib linearly extending along a peripheral part of the optical member, and the limiting part has a groove that is provided to be sandwiched by a pair of the protrusion parts and receives the rib. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification