HEAD-MOUNTED DISPLAY DEVICE

• US 20150253576A1
• Filed: 03/10/2015
• Published: 09/10/2015
• Est. Priority Date: 03/10/2014
• Status: Active Grant

• Current Assignee: Olympus Corporation
• Original Assignee: Olympus Corporation
• Inventors: SUGIHARA, Ryohei, IBA, Yoichi, TAKAHASHI, Shinya
• Granted Patent: US 10,168,454 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 2027/0143 the two eyes not being equipped with identical nor symmetrical optical devices
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 27/0176 characterised by mechanical features
• CPC Class Codes: G02B 5/04 Prisms

Abstract

A head-mounted display device is provided, the head-mounted display device including: a display element; a light guide prism that includes an incident surface through which image light from the display element enters and that guides the image light to user'"'"'s eyes; and a housing that contains the display element and the light guide prism; and support unit that fixes the housing to user'"'"'s head. The light guide prism is partially covered by and contained in the housing. A portion of side surface of the light guide prism covered by the housing is formed with a first groove, and portion of side surface of the light guide prism exposed outside the housing is formed with a second groove. Depth of the first groove measured from the side surface is greater than that of the second groove.

Claims

1. A head-mounted display device, comprising:

a display element;

a light guide prism that includes an incident surface through which image light from the display element enters the light guide prism, that guides the entered image light to user'"'"'s eyes, and that emits the guided image light to user'"'"'s eyeballs;

a housing that contains the display element and the light guide prism; and

a support unit that fixes the housing to a user'"'"'s head, wherein

the light guide prism is partially covered by and contained in the housing, a portion of a side surface of the light guide prism that is covered by the housing being formed with a first groove, and a portion of the side surface of the light guide prism that is exposed outside the housing being formed with a second groove, and

a depth of the first groove measured from the side surface is greater than a depth of the second groove measured from the side surface.

2. The head-mounted display device of claim 1, wherein

each of the first groove and the second groove is defined by two tilted surfaces and has a V-shaped sectional form.

3. The head-mounted display device of claim 2, wherein

a tilt angle formed by the two tilted surfaces defining the first groove with respect to the side surface of the light guide prism that is located adjacent to the first groove is greater than that formed by the two tilted surfaces defining the second groove with respect to the side surface of the light guide prism that is located adjacent to the second groove.

4. The head-mounted display device of claim 2, wherein

one of the two tilted surfaces defining the first groove that is located closer to the incident surface is formed at a tilt angle not satisfying a total reflection condition with respect to at least part of light beams constituting the image light, which directly enters the light guide prism from the display element through the incident surface, and one of the two tilted surfaces defining the second groove that is located closer to the incident surface is formed at a tilt angle satisfying the total reflection condition with respect to all of the light beams constituting the image light, which directly enters the light guide prism from the display element through the incident surface.

5. The head-mounted display device of claim 2, wherein

the two tilted surfaces of the first groove are coated with a light shielding coating.

6. The head-mounted display device of claim 2, wherein

the two tilted surfaces of the first groove and the housing defines space that is embedded with a light shielding member.

7. The head-mounted display device of claim 6, wherein

the light shielding member is fixed to or formed on the housing.

8. A head-mounted display device, comprising:

a display element;

a light guide prism that includes an incident surface through which image light from the display element enters the light guide prism, that guides the entered image light to user'"'"'s eyes, and that emits the guided image light to user'"'"'s eyeballs;

a housing that contains the display element and the light guide prism; and

a support unit that fixes the housing to a user'"'"'s head, wherein

the light guide prism is partially covered by and contained in the housing, a portion of a side surface of the light guide prism that is covered by the housing being formed with a first groove, and a portion of the side surface of the light guide prism that is exposed outside the housing being formed with a second groove, and

a shape of the first groove differs from a shape of the second groove, and the first groove is treated with light shielding treatment, and the second groove is left untreated with light shielding treatment.