Projection type image display apparatus

A projection image display apparatus comprising:

• a projection optical system configured to project an image light onto a screen;
• an optical component holding member holding at least one optical component of the projection optical system;
• a reflective image forming device configured to separate an illumination light into image light to be projected onto the screen and other unnecessary light according to an input signal thereto;
• a reflection element configured to reflect the unnecessary light arranged in a space between the reflective image forming device and the projection optical system;
• and
• a first transparent member;
• wherein the reflective image forming device is held by the optical component holding member via an image forming device holder;
• wherein the optical component holding member has a tube portion having a first opening, the image forming device holder is held to the first opening, and the optical component holding member has a second opening for leading the unnecessary light reflected by the reflection element to the outside of the optical component holding member;
• wherein the first transparent member covers the second opening;
• and
• wherein the reflection element is configured to reflect the unnecessary light not towards the projection optical system but towards an optical path of the illumination light.

A projection image display apparatus comprising:

• a projection optical system configured to project an image light onto a screen;
• an optical component holding member holding at least one optical component of the projection optical system;
• a reflective image forming device configured to separate an illumination light into image light to be projected onto the screen and other unnecessary light according to an input signal thereto;
• a reflection element configured to reflect the unnecessary light arranged in a space between the reflective image forming device and the projection optical system;
• a first transparent member;
• and
• a second transparent member arranged on an optical path of the image light between the reflective image forming device and the projection optical system and being held by the optical component holding member;
• wherein the reflective image forming device is held by the optical component holding member via an image forming device holder;
• wherein the optical component holding member has a tube portion having a first opening, the image forming device holder is held to the first opening, and the optical component holding member has a second opening for leading the unnecessary light reflected by the reflection element to the outside of the optical component holding member;
• wherein the first transparent member covers the second opening;
• and
• wherein the optical component holding member, the reflective image forming device, the image forming device holder, the first transparent member, and the second transparent member surround a space between the reflective image forming device and the projection optical system.