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1 ContributionOffice Chair Design for Notebook PC Work, by Hiroyuki ISHIKURA & Nobutoshi YAMAZAKI. Desk sharing in offices has become recently a trend due to the wide spread use of notebook computers. However, they are not always comfortable to use either for reading or typing. We measured the most suitable seating conditions for working with notebook computers. Within the range of heights from the 5th percentile of young females to the 95th percentile of young males, the following optimal conditions were determined. The angles of the keyboard, lower backrest, upper backrest and seat are 10, 68, 79and 10, respectively. The depth of the middle part is shortened to 354 mm for short user. The depths of both outside sections are lengthened to 378 mm, with inclined lateral supportsmaximum angle 35for tall user. To allow the display to be comfortably read, the seat height must be mm, which is lower than that for conventional office chairs. Evaluations showed that when using this prototype seat in a working environment for 40 minutes, muscle activities in the shoulder and back, and leg swelling were reduced to those when using a conventional office chair, without any decrease in work efficiency. Also, forward tilting of the head decreased by 9and the shoulder elevation was improved. PC PC 595PC PC mm354 mm378 mm mm 40PC 9 PC 1 PC 1,2 PC Graduate School of Science and Technology, Keio University Department of Mechanical Engineerng, Faculty of Science and Technology, Keio University mmpc PC n8-13 VMC5243L 54

2 mm mm PC PC Epson Endeavor NT mm288 mm 30 mm 3 I II4 1FQR 5 mm II Tab. 1 Characteristics of participants. 2 Fig. 2 Adjustable experimental chair. 1 Fig. 1 Definition of measuring point.

3 II PC 3 Fig. 3 Effect on the initial support line. 4 Fig. 4 Experimental overview. 5 Fig. 5 Definition of length and angle of seat shape PC PC PC N mm mmn 720 mm mm ϕ θ 6 Fig. 6 Neck posture. ϕ θ 56

4 y x 7 Fig. 7 Seat height. 10 Fig. 10 Front bending angle. 8 Fig. 8 Seat shape. y x mm PC JIS700 mm Fig. 9 Seat angle Fig. 11 Side support base distance mm mm92727 mm mm mm mm mm 354 mm 378 mm

5 mm mm 12 Fig. 12 Side support angle. 13 Fig. 13 Side support top distance mm mm M 15 Fig. 15 Individual difference of backrest shape. 14 Fig. 14 Side support and sagittal shape. 16 Fig. 16 Backrest length. 58

6 mm Fig. 17 Most depressed point position of the chest. 18 Fig. 18 Upper backrest angle mm a 10 mm 353 kg/m mm10 PC PC20b Fig. 19 Proposed seat shape. 20 Fig. 20 Experimental condition for design evaluation. 2 Tab. 2 Comparison of working amount. 59

7 22 Fig. 22 Comparison of muscle activities. 21 Fig. 21 Example of sitting posture and pressure. WordExcel Word Excel 2t PC5 PC2 VMC5243L BIGMAT mm mm kpa73 kpa205 kpa 227 kpa S&MEBiolog DL-3000 ** ** 1000 Hz Fig. 23 Leg swelling PC1 BI 8 BI BI 2t23 40BI 35 60

8 24 Fig. 24 Pelvis posture changing mm48.5 kg 90 PC 5 PC10 PC PC Fig. 25 Practical proto-type of notebook PC chair ATR-PromotionsWAA-010 PC mm67.5 kg4 1,,,,,, VDT,, 48, 7-14, ,,,,,, VDT,, 46, , Saito S, Miyao M, Kondo T, Sakakibara H, Toyoshima HErgonomic Evaluation of Working Posture of VDT Operation Using Personal Computer with Flat Panel Display, Industrial Health, 35, , Asundi K, Odell D, Luce A, Dennerlein J TNotebook computer use on a desk, lap and lap supporteffects on posture, performance and comfort, Ergonomics, 531, 74-82, , VDT,, 37, , ,,, 481, 27-34, ,,, 434, , ,, VDT,, 435, , VDT,, 23, 58-59, ,,,

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