NEC VT440, VT540 user manual Ceiling Installation, Reflecting the Image

Ceiling Installation

		Formulas(mm)
		H” = Horizontal Screen Width (inch)
F		A = C/cosα
		B = 94 + 5.5 ⋅ M
B	α	C (wide) = 36.8712 ⋅ (diagonal screen size/ 0.92205) – 43.5689
		C (tele) = C(wide) ⋅ 1.2
		F = 1.4516 ⋅ M – 94
		M = 1.25H” / 22.86

	Formulas(inch)
	H” = Horizontal Screen Width
A	A = C/cosα
	B = (94+5.5 ⋅ M) / 25.4
	C (wide) = (36.8712 ⋅	(diagonal screen size/0.92205) – 43.5689) / 25.4
C	C (tele) = C (wide) ⋅	1.2
	F = 1.4516 ⋅ M – 94/25.4

M = 1.25H / 0.9

A: Distance between the lens and the screen center

B: Vertical distance between the top of the supplied ceiling mount and the screen center

C: Horizontal throw distance between screen surface and the lens

F: Vertical distance between projector base and top of image

Zoom Lens (Wide)

α			degree	9.01	8.93	8.85	8.82	8.81	8.79	8.78	8.77	8.75	8.74	8.74	8.73	8.72	8.72
β	(=sinα	)		0.16	0.16	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15	0.15
γ	(=cosα	)		0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99
Screen Size H-Width			inch	24	32	48	56	64	72	80	96	120	144	160	192	216	240
4:3 Diagonal			inch	30	40	60	70	80	90	100	120	150	180	200	240	270	300
A			mm	1171	1471	2242	2628	3013	3399	3785	4556	5713	6870	7641	9184	10341	11498
			inch	46	58	88	103	119	134	149	179	225	270	301	362	407	453
C			mm	1156	1556	2356	2756	3155	3555	3955	4755	5955	7154	7954	9554	10753	11953
			inch	46	61	93	108	124	140	156	187	234	282	313	376	423	471
B			mm	277	338	461	522	583	644	705	827	1011	1194	1316	1561	1744	1927
			inch	11	13	18	21	23	25	28	33	40	47	52	61	69	76
F			mm	-46	-29	3	19	35	51	67	100	148	196	229	293	341	390
			inch	-2	-1	0	1	1	2	3	4	6	8	9	12	13	15

Zoom Lens (Tele)

α			degree	6.28	7.1	7.0	7.0	7.0	7.0	6.9	6.9	6.9	6.9	6.9	6.9	6.9	6.9
β	(=sinα	)		0.11	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.12
γ	(=cosα	)		0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99	0.99
Screen Size H-Width			inch	20	32	48	56	64	72	80	96	120	144	160	192	216	240
4:3 Diagonal			inch	25	40	60	70	80	90	100	120	150	180	200	240	270	300
A			mm	1396	1902	2900	3399	3898	4397	4896	5893	7390	8887	9885	11881	13378	14875
			inch	55	75	114	134	153	173	193	232	291	350	389	468	527	586
C			mm	1387	1867	2827	3307	3787	4266	4746	5706	7146	8585	9545	11464	12904	14344
			inch	55	74	111	130	149	168	187	225	281	338	376	451	508	565
B			mm	247	338	461	522	583	644	705	827	1011	1194	1316	1561	1744	1927
			inch	10	13	18	21	23	25	28	33	40	47	52	61	69	76
F			mm	-54	-29	3	19	35	51	67	100	148	196	229	293	341	390
			inch	-2	-1	0	1	1	2	3	4	6	8	9	12	13	15

WARNING

•Installing your projector on the ceiling must be done by a quali- fied technician. Contact your NEC dealer for more informa- tion.

* Do not attempt to install the projector yourself.

•Only use your projector on a solid, level surface. If the projec- tor falls to the ground, you can be injured and the projector severely damaged.

•Do not use the projector where temperatures vary greatly. The projector must be used at temperatures between 32˚F (0˚C) and 95˚F (35˚C).

•Do not expose the projector to moisture, dust, or smoke. This will harm the screen image.

•Ensure that you have adequate ventilation around your pro- jector so heat can dissipate. Do not cover the vents on the side or the front of the projector.

If your projector is mounted on the ceiling and your image is upside down, use the “Menu” and “Select” buttons on your projector cabi- net or ▲▼ button on your remote control to correct the orientation. (See page E-31.)

Reflecting the Image

Using a mirror to reflect your projector’s image enables you to enjoy a much larger image. Contact your NEC dealer if you need a mirror. If you’re using a mirror and your image is inverted, use the “Menu” and “Select” buttons on your projector cabinet or ▲▼ buttons on your remote control to correct the orientation. (See page E-31.)

E–16