Patent ID: 11960096
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC F  G  H

Claim 0:
1. A head-mounted display device comprising:
an image display located posterior to a plane that is in contact with both eyeballs of the wearer to emit image light;
a light guide plate to guide the image light and emit the image light to an eye of a wearer who wears the head-mounted display device, the light guide plate including a reflection structure and a light guide structure to reflect the image light to outside of the light guide plate toward the eye of the wearer;
a relay optical structure arranged between the image display and the light guide plate to relay the image light from the image display to the light guide plate;
an optical structure located between the relay optical structure and the light guide plate to transform the image light to one of parallel light and telecentric light; and
a control substrate disposed at a side of an optical axis of the image light, which is from the image display to the light guide plate, opposite from the eye,
wherein the optical structure comprises a collimator optical structure,
a first intermediate image is formed after the image light is emitted from the relay optical structure and before the image light enters the collimator optical structure,
the relay optical structure is a relay lens group that includes a plurality of lenses each having a diameter in a range of equal to or larger than 2 mm and equal to or smaller than 8 mm and arranged inside a housing frame,
the housing frame is disposed at a side of the wearer's head and connects the image display to the light guide plate, and
a longitudinal direction of the control substrate is orthogonal to a light emitting surface of the image display.