Method for manufacturing light guide device, light guide device, and virtual image display apparatus

摘要

During the manufacturing of the light guide device (20), the first and second bonding ribs (R1,R2) are used such that the light guide prism (10) and the opposing prism (50) are connected with each other from a specific offset direction. In this case, a difference between sizes of clearances between the first bonding surface (AS) and the second bonding surface (BS) caused by a difference in inclination angles of the offset direction with respect to the first bonding surface is used such that a flow direction of the adhesive is controlled and filling is performed in a desire state, and thus high accuracy of the joint formed by the adhesive is maintained.

主权项

1. A method for manufacturing a light guide device including a light guide prism that includes a mirror layer which performs reflection of image light propagated inward on a first bonding surface which is a light guide side bonding surface, an opposing prism that includes a second bonding surface which is arranged to oppose the first bonding surface and is a bonding surface on an opposite side corresponding to the first bonding surface, and is bonded with the light guide prism by bonding the first bonding surface and the second bonding surface with each other across the mirror layer, and a joint that is formed by an adhesive which is filled in an adhesion area between the first bonding surface and the second bonding surface,
in which the first bonding surface of the light guide prism is a free-form surface and the second bonding surface of the opposing prism is a free-form surface having substantially the same shape as the first bonding surface, the method comprising: a preparing step in which the first bonding surface and the second bonding surface are caused to oppose each other, and the light guide prism and the opposing prism are arranged to approach each other in a specific offset direction in which an inclination angle with respect to one end side of the first bonding surface and an inclination angle with respect to the other end side have the same orientation but different sizes; an adhesive applying step in which the adhesive is applied to at least one surface of the first bonding surface and the second bonding surface that oppose each other in the preparing step; an adhering step in which the second bonding surface and the first bonding surface are caused to approach each other in the offset direction such that the adhesive applied during the adhesive applying step is interposed so as to be filled between the light guide prism and the opposing prism; and a bonding step in which the adhesive that is filled between the first bonding surface and the second bonding surface during the adhering step is cured such that the joint which bonds the light guide prism and the opposing prism with each other is formed.