NEC VT540, VT440 user manual Distance Chart, Zoom Lens Wide, Zoom Lens Tele, Screen inch

Distance Chart

E

D

C

A:	Distance between the
A	lens and the screen cen-
	ter
C: Horizontal throw dis-
	tance between screen
	surface and the lens
D: Vertical distance be-
α	tween projector base
	and base of image

E: Vertical distance be- tween projector base and screen center

Screen (inch)

H

4:3 Diagonal

Formulas(mm)	Formulas(inch)
"H = Horizontal Screen Width	"H = Horizontal Screen Width
A = C/cosα	A = C/cosα
C (wide) = 36.8712 ⋅ (diagonal screen size/ 0.92205) – 43.5689	C (wide) = (36.8712 ⋅ (diagonal screen size/0.92205) – 43.5689) / 25.4
C (tele) = C(wide) ⋅ 1.2	C (tele) = C (wide) ⋅ 1.2
D = 1.45 ⋅ M – 62.9	D = 1.45 ⋅ M – 62.9 / 25.4
E = 62.9 + 5.5M	E = (62.9 + 5.5M) / 25.4
M = 1.25H / 22.86	M = 1.25H / 0.9

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	1575	2384	2789	3193	3598	4002	4811	6025	7238	8047	9666	10879	12093
			inch	46	62	94	110	126	142	158	189	237	285	317	381	428	476
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
D			mm	-15	2	34	50	66	82	98	130	179	227	259	324	372	420
			inch	-1	0	1	2	3	3	4	5	7	9	10	13	15	17
E			mm	246	307	430	491	552	613	674	796	980	1163	1285	1530	1713	1896
			inch	10	12	17	19	22	24	27	31	39	46	51	60	67	75
Zoom Lens (Tele)
α			degree	6.28	7.46	7.39	7.37	7.36	7.35	7.34	7.32	7.31	7.30	7.30	7.29	7.29	7.28
β	(=sinα	)		0.11	0.13	0.13	0.13	0.13	0.13	0.13	0.13	0.13	0.13	0.13	0.13	0.13	0.13
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	1883	2851	3334	3818	4302	4785	5753	7204	8655	9623	11558	13009	14460
			inch	55	74	112	131	150	169	188	226	284	341	379	455	512	569
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
D			mm	-23	2	34	50	66	82	98	130	179	227	259	324	372	420
			inch	-1	0	1	2	3	3	4	5	7	9	10	13	15	17
E			mm	216	307	430	491	552	613	674	796	980	1163	1285	1530	1713	1896
			inch	8	12	17	19	22	24	27	31	39	46	51	60	67	75

Distance Chart

NOTE: Distances may vary +/–5%.

(inch)SizeScreen	300							(inch)SizeScreen
	250
	200
	150
	100
	50
	0
	0	2	4	6	8	10	12

Throwing Distance (m)

wide

300

250

200

150

100

50

0

0 100 200 300 400

Throwing Distance (inch)

tele

Throwing Distance		Screen Size (inch)
(inch)	(m)	Wide	Tele
45	1.2	30	25
61	1.6	40	33
93	2.4	60	50
108	2.8	70	58
124	3.2	80	67
140	3.6	90	75
156	4.0	100	83
187	4.8	120	100
234	6.0	150	125
282	7.2	180	150
313	8.0	200	167
376	9.6	240	200
423	10.8	270	225
471	12.0	300	250

E–15